Smalltalk was the first purest ______ language and pioneered graphical user interface.
Object Oriented
Which of the following is the incorrect option form the following statements regarding ‘objectives of learning new languages’ ?
Help in understanding the language privacy policy.
Binary operator in SNOBOL must has at least _____ spaces on both sides.
1
A space is used as ______ for concatenation.
Operator
Sign is used for ______ in SONOBOL.
Line Continuation
Following are some of the reasons for studying concepts related to different
programming languages EXCEPT
Increased capability to design communication links
COBOL was the first language that brings the concept of _________ .
Structure
A language evaluation criteria includes following factor EXCEPT
Modularity
Note that, in C++, similar problems can arise when a class that has pointer data members is passed by value. This problem is addressed by the use of copy constructors, which can be defined to make copies of the values pointed to, rather than just making copies of the pointers. In Java, the solution is to use the arraycopy operation, or to use a class’s clone operation. Cloning will be discussed later.
Early Multiple Selectors
FORTRAN arithmetic IF (a three-way selector)
IF (arithmetic expression) N1, N2, N3
Bad aspects:
Not encapsulated
(Selectable segments could be anywhere)
Segments require GOTO’s
Write three different methods how to write strings in PHP? 3
Answer:
Strings
PHP strings are created using single quote or double quote.
They can also be created by <<< which is called heredoc. One should provide an identifier after <<<, then the string, and then the same identifier to close the quotation. The closing identifier must begin in the first column of the line.
How to convert PHP string in numeric value? 2
Answer:
String conversion to numbers
When a string is evaluated as a numeric value, the resulting value and type are determined as follows.
• The string will evaluate as a float if it contains any of the characters ‘.’, ‘e’, or ‘E’. Otherwise, it will evaluate as an integer.
• The value is given by the initial portion of the string. If the string starts with valid numeric data, this will be the value used. Otherwise, the value will be 0 (zero).
Here is an example:
<?php
$foo = 2 + “10.5”; // $foo is float (12.5)
$foo = 1 + “-1.1e3”; // $foo is float (-1099)
$foo = 1 + “Ali-1.3e3"; // $foo is integer (1)
$foo = 1 + “10 Small Cats”; // $foo is integer (11)
$foo = "10.0 cats " + 1; // $foo is float (11)
?>
Using strings in numeric expressions provides flexibility but it should be obvious that it also is a source to numerous programming errors and mistakes. This kind of error is also very hard to debug and detect.
Discuss readability problem using control statements? 2
Answer:
Readability
Readability is directly related to the cost of maintenance. The different factors that impact readability are:
Control Statements
Control statements also play an important role in readability. We are all aware of the hazards of goto statement. If a language relies on goto statements for control flow, the logic becomes difficult to follows and hence understands and maintain. Restricted use of goto in extreme was needed and useful as well but with the emergence of new language constructs to handle those situations, it probably not an issue any more.
What are the enumeration and subrange types? Differentiate these two in points.
Answer:
An enumeration type is one in which all of the possible values, which are named constants, are provided in the definition. Enumeration types provide a way of defining and grouping collections of name constants, which are called enumeration constants. An example in C#:
enum days {Mon, Tue, Wed, Thu, Fri, Sat, Sun};
A subrange type is a contiguous subsequence of an ordinal type. For example, p. 264 12 … 14 is a subrange of integer type.
Differentiate between the implicit and explicit type conversion with respect to Java. (5)
Answer:
Type Conversion
Java is much stronger than C++ in the type conversions that are allowed.
Here we discuss conversions among primitive types. Conversions among class objects will be discussed later.
Booleans cannot be converted to other types. For the other primitive types (char, byte, short, int, long, float, and double), there are two kinds of conversion: implicit and explicit.
Implicit conversions:
An implicit conversion means that a value of one type is changed to a value of another type without any special directive from the programmer. A char can be implicitly converted to an int, a long, a float, or a double. For example, the following will compile without error:
char c = 'a';
int k = c;
long x = c;
float y = c;
double d = c;
For the other (numeric) primitive types, the basic rule is that implicit conversions can be done from one type to another if the range of values of the first type is a subset of the range of values of the second type. For example, a byte can be converted to a short, int, long or float; a short can be converted to an int, long, float, or double, etc.
Explicit conversions:
Explicit conversions are done via casting: the name of the type to which you want a value converted is given, in parentheses, in front of the value. For example, the following code uses casts to convert a value of type double to a value of type int, and to convert a value of type double to a value of type short:
double d = 5.6; int k = (int)d; short s = (short)(d * 2.0);
Casting can be used to convert among any of the primitive types except boolean. Note, however, that casting can lose information; for example, floating-point values are truncated when they are cast to integers (e.g., the value of k in the code fragment given above is 5), and casting among integer types can produce wildly different values (because upper bits, possibly including the sign bit, are lost).
What are interpreted and compiled languages? Give examples (5)
Answer:
In an interpreted environment, the instructions are executed immediately after parsing. Both tasks are performed by the interpreter. Interpreted languages include the MS-Dos Batch language (the OS itself is the interpreter), shell scripts in Unix/Linux systems, Java, Perl and BASICA (a very old BASIC language). Advantages of interpreted languages include relative ease of programming (since once you type your instructions into a text file, the interpreter can run it) and no linker is required. Disadvantages include poor speed performance and that you do not generate an executable (and therefore distributable) program. The interpreter must be present on a system to run the program.
Modern programming contexts like ‘virtual machines’ managed frameworks are essentially interpreters. These are designed so that any architecture specific information is handled by the virtual machine, allowing the same source code to run on any type of platform.
Compilers parse the instructions into machine code and store them in a separate file for later execution. Many modern compilers can compile (parse) and execute in memory, giving the ‘appearance’ of an interpreted language. However, the key difference is that parsing and execution occurs in two distinct steps. Examples include newer forms of BASIC (such as Visual Basic), C/C++, Delphi and many others. In a compiled environment, you may speak of several separate files: source code (the text instructions you actually enter), object code (the parsed source code) and the executable (the linked object code). There is definitely an increase in complexity in using compilers, but the key advantages are speed performance and that you can distribute stand-alone executables.
Whether using a compiled or interpreted language, you will likely need a text editor in which to enter your instructions. Many compilers come complete with integrated editors optimized for working with the specific language. Using these editors is really not much different from using general text editing tools and word processors, though they may look quite different. One key point here is that so long as you follow the proper format requirements for a given interpreter or compiler, you can use any text editor you chose to construct and edit your source code.
Differentiate between client side scripting and server side scripting languages? (5)
Answer:
JavaScript – client side scripting
Primary objective of JavaScript is to create dynamic HTML documents and check validity of input forms. It is usually embedded in an HTML document. It is not really related to Java
PHP (Personal Home Page) – server-side scripting
It is interpreted on the Web Server when the HTML document in which embedded is requested by the browser. It often produces HTML code as an output and is very similar to JavaScript. It allows simple access to HTML form data and makes form processing easy. It also provides support for many different database management systems and hence provides Web access to databases.
Describe the programming steps in Prolog? (5)
Answer:
PROLOG programming follows the following steps:
¬ Declaring some facts about objects and their relationships
¬ Defining some rules about objects and their relationships
¬ Asking questions about objects and their relationships
Explain the Prolog features regarding its applications in real world. (5)
Answer:
You can find PROLOG in areas like expert systems or theorem provers construction. The variant of PROLOG called DATALOG is used in database management.
Prolog is a declarative programming language where we only specify what we need rather than how to do it. It has a simple concise syntax with built-in tree formation and backtracking which generates readable code which is easy to maintain. It is relatively case and type insensitive and is suitable for problem solving / searching, expert systems / knowledge representation, language processing / parsing and NLP, and game playing.
Efficiency is definitely is negative point. While writing programs one has to be aware of the left recursion, failing to do that may result in infinite loops. It has a steep learning curve and suffers from lack of standardization
Define and explain “throws Clause” and the “finally Clause” with respect to exception handling in Java. (5)
Answer:
Throws Clause
Throws clause is overloaded in C++ and conveys two different meanings: one as specification and the other as command. Java is similar in syntax but different in semantics. The appearance of an exception class name in the throws clause of Java method specifies that the exception class or any of its descendents can be thrown by the method.
A C++ program unit that does not include a throw clause can throw any exceptions. A Java method that does not include a throws cannot throw any checked exception it does not handle. A method cannot declare more exceptions in its throws clause than the methods it overrides, though it may declare fewer. A method that does not throw a particular exception, but calls another method that could throw the exception, must list the exception in its throws clause.
The finally clause
A Java exception handler may have a finally clause. A finally clause always executes when its try block executes (whether or not there is an exception). The finally clause is written as shown below:
try {
…
}
catch (…) {
…
}
…
finally {
…
}
A finally clause is usually included to make sure that some clean-up (e.g., closing opened files) is done. If the finally clause includes a transfer of control statement (return, break, continue, throw) then that statement overrides any transfer of control initiated in the try or in a catch clause.
46. How do Ada and COBOL differ by syntax and semantics in referencing a record element? Give examples of each (5)
Answer:
Q.1: Discuss the significance of readability as the language evaluation criterion. Readability:
Q.2: Convert the following code in C in to equivalent LISP code using the most appropriate constructs:
Q.3: Identify the mistake(s) in the following Ada code segment. After correcting it, convert it into equivalent C and LISP code:
Q.4: We studied several reasons to study programming languages. With that context in mind discuss:
(a) Increased capacity to express programming concepts
(b) Improved background for choosing appropriate languages and show the output.
Q.5: For the following SNOBOL program, explain the meaning of each line
Q.6: Discuss the difference between enumeration types of C and Ada. Which is better and why?
Q.1. what is quoted atom in prolog ?
Quoted atoms - sequence of characters surrounded by single quotes. Examples: ‘Apple’ ‘hello world’
Q. 2. what is subprogram issues in different languages ? Q. 3. what seal struct and abstract means in C# ?
An abstract class is any class thatincludes an abstract method. It is similar to Pure virtual in C++.If a class includes an abstract method, the class must be declared abstract, too.
Q. 4. How to differentiate between c and c++ ? Q. 5. what is notify and wait in java?
Threads are based upon the concept of a Monitor. The wait and notify methods are used just like wait and signal in a Monitor. They allow two threads to cooperate and based on
a single shared lock object. Q.6. what query in prolog?
Queries are used to retrieve information from the database. A query is a pattern that
PROLOG is asked to match against the database and has the syntax of a compound query.
It may contain variables. A query will cause PROLOG to look at the database, try to find a match for the query pattern, execute the body of the matching head, and return an
answer Q.7. How to differentiate between c++ and java? Q.8. what is monitor in java thread?
Threads are based upon the concept of a Monitor. The wait and notify methods are used just like wait and signal in a Monitor. They allow two threads to cooperate and based on a single shared lock object. Q.9. what is managed code?
Managed code is executed under the control of Common Language Runtime (CRL).
It has automatic garbage collection. That is, the dynamically allocated memory area which is no longer is in use is not destroyed by the programmer explicitly. It is rather automatically returned back to heap by the built-in garbage collector. There is no explicit memory’s allocation and deallocation and there is no explicit call to the garbage collector. Q.10. how many ways the static binding can be define?
A binding is static if it occurs before run time and remains unchanged throughout program execution
CS508 Solved Papers of Modern Programming Languages Final Term fall 2010 (Subjective and Objective Part) Question Papers
For Recursion it is necessary that a language
1)Dynamic
Static
Both dynamic and static
Stack
2) Object in java script can be accessed through ………
Reference pointer method
None of the above
3) object in java script can be access different techniques
• Java script
• C++
• C#
• Ada
4)A … implicit… is a default mechanism for specify types of variable?
5)A reserved word is a special word that cannot be used as a user-defined name
6) Variable use in VB without declaring decrease reliability and increase ……
Readably
Writeable
Cost
compile time
7).Dot operator in a …. SNOBOL?
Reference pointer
Unary pointer
Class pointer
Binary pointer
8)The GOTO statement in SNOBOL is ……
Explicit
Punter method
Implementation
An Indirect Reference
Ada has … do while loop just like C++
Also
No
Defective
None of the above
We use tagged type inAda……
The last value execution in the ……LISP is the return value
Autom
Object
12)Dotimes loop of LISP similar working to ada
For
Switch loop
Do while
While
13)Capital letter or underscore in PROLOG
14)Variable in PROLOG …. Are any value is associated that can not be changed.
15)Control structure is a ……if…… statement
16)……… anonymous ………… is placeholder value that is not required
Prolog variable are actually constant placeholders and NOT really variables.
17)One difference LISP and PROLOG is
AI
Puzzle
Game
18)…PROLOG. Is very effective solving puzzle?
19)…java… is support oop?
20)Variable of ………. Is not an object of java
Primitive
Reference
Integer type
Both reference and Primitive
21)In ……… handling throw class is overloaded
C++
Java
C#
C# and java
22)C# and C++ have ……… size
Same
Different
Distinct
None of the given
In C## struct are used as …………
Javascript …related… from java languafe
In … …… we have to address the client side compatibility issue.
26 _______exception inherits from exception class and _________ exception is anywhere in the program.
Select correct option:
Java , C#
C++ , C# c
C# , Java
Java ,C++
Two example of predefined reference type in C#? 2 marks
Reference Types
arrays classes
There are no struct, union, enum, unsigned, typedef, or pointers types in Java
Differnet of C and C++ 2 marks
C++ Differs from C in two ways:
The control expression can also be Boolean
The initial expression can include variable definitions (scope is from the definition to the end of the function in which it is defined).
What is DOM?
Document Object Model
Two examples of atoms in PROLOG syntax?
Atoms:
Atoms include numbers, symbols, and strings. It supports both real numbers and integers.
symbols: a symbol in LISP is a consecutive sequence of characters (no space). For example a, x, and price-of-beef are symbols. There are two special symbols: T and NIL for logical true and false.
strings: a string is a sequence of characters bounded by double quotes. For example “this is red” is a string.
Note language genrality? 2marks
What term Class attribute in C#? marks
Difference between proper example Union type and ada discriminated type? 2marks
What is the function of cut(!) predicate in PROLOG? 2 marks
Division by zero is an expression? what type of error is this and either handled by compiler or it through exception? 3marks
How Short circuit evolution is performed inAdaand fortran? 3 marks
Problem with Short Circuiting
(a > b) || (b++ / 3)
Short-circuit evaluation exposes the potential
problem of side effects in expressions
Discuss the issue related with declaring a method/class as final java? 3 marks
Solution:
Final Fields and Methods
Fields and methods can also be declared final. A final method cannot be overridden in a subclass. A final field is like a constant: once it has been given a value, it cannot be assigned to again.
Difference between Actual Parameter and Predicate parameter? 3 marks
With suitable examples the concept of boxing in C#. How C# is different there concept from other languages? 3 marks
Sol:
Boxing
Boxing is converting any value type to corresponding object type and convert the resultant ‘boxed’ type back again.
int i = 123; object box = i; // value of i is copied to the object box
if (box is int){ // runtime type of box is returned as
// boxed value type
Console.Write(“Box contains an int”);
// this line is printed
}
Notation of actual /formal Parameters? 3 marks
Solution?
Actual/Formal Parameter Correspondence:
Aliasing Problem in java Script? with suitable examples. 5 marks
Solution:
Aliasing Problems in Java
The fact that arrays and classes are really pointers in Java can lead to some problems. Here is a simple assignment that causes aliasing:
int [] A = new int [4];
Int [] B = new int [2];
This is depicted as below:
This obviously creates problems. Therefore, as a programmer you have to be very careful when writing programs in Java.
In Java, all parameters are passed by value, but for arrays and classes the actual parameter is really a pointer, so changing an array element, or a class field inside the function does change the actual parameter’s element or field.
This is elaborated with the help of the following example:
A ) {
A[0] = 10; // change an element of parameter A
A = null; // change A itself
}
void g() {
B = new int [3];
B[0] = 5;
f(B);
// B is not null here, because B itself was passed by value
// however, B[0] is now 10, because function f changed the
// first element of the array
}
Note that, in C++, similar problems can arise when a class that has pointer data members is passed by value. This problem is addressed by the use of copy constructors, which can be defined to make copies of the values pointed to, rather than just making copies of the pointers. In Java, the solution is to use the arraycopy operation, or to use a class’s clone operation. Cloning will be discussed later
Note that, in C++, similar problems can arise when a class that has pointer data members is passed by value. This problem is addressed by the use of copy constructors, which can be defined to make copies of the values pointed to, rather than just making copies of the pointers. In Java, the solution is to use the arraycopy operation, or to use a class’s clone operation. Cloning will be discussed later.
Early Multiple Selectors
FORTRAN arithmetic IF (a three-way selector)
IF (arithmetic expression) N1, N2, N3
Bad aspects:
Not encapsulated
(Selectable segments could be anywhere)
Segments require GOTO’s
Write three different methods how to write strings in PHP? 3
Answer:
Strings
PHP strings are created using single quote or double quote.
They can also be created by <<< which is called heredoc. One should provide an identifier after <<<, then the string, and then the same identifier to close the quotation. The closing identifier must begin in the first column of the line.
How to convert PHP string in numeric value? 2
Answer:
String conversion to numbers
When a string is evaluated as a numeric value, the resulting value and type are determined as follows.
• The string will evaluate as a float if it contains any of the characters ‘.’, ‘e’, or ‘E’. Otherwise, it will evaluate as an integer.
• The value is given by the initial portion of the string. If the string starts with valid numeric data, this will be the value used. Otherwise, the value will be 0 (zero).
Here is an example:
<?php
$foo = 2 + “10.5”; // $foo is float (12.5)
$foo = 1 + “-1.1e3”; // $foo is float (-1099)
$foo = 1 + “Ali-1.3e3"; // $foo is integer (1)
$foo = 1 + “10 Small Cats”; // $foo is integer (11)
$foo = "10.0 cats " + 1; // $foo is float (11)
?>
Using strings in numeric expressions provides flexibility but it should be obvious that it also is a source to numerous programming errors and mistakes. This kind of error is also very hard to debug and detect.
Discuss readability problem using control statements? 2
Answer:
Readability
Readability is directly related to the cost of maintenance. The different factors that impact readability are:
Control Statements
Control statements also play an important role in readability. We are all aware of the hazards of goto statement. If a language relies on goto statements for control flow, the logic becomes difficult to follows and hence understands and maintain. Restricted use of goto in extreme was needed and useful as well but with the emergence of new language constructs to handle those situations, it probably not an issue any more.
What are the enumeration and subrange types? Differentiate these two in points.
Answer:
An enumeration type is one in which all of the possible values, which are named constants, are provided in the definition. Enumeration types provide a way of defining and grouping collections of name constants, which are called enumeration constants. An example in C#:
enum days {Mon, Tue, Wed, Thu, Fri, Sat, Sun};
A subrange type is a contiguous subsequence of an ordinal type. For example, p. 264 12 … 14 is a subrange of integer type.
Differentiate between the implicit and explicit type conversion with respect to Java. (5)
Answer:
Type Conversion
Java is much stronger than C++ in the type conversions that are allowed.
Here we discuss conversions among primitive types. Conversions among class objects will be discussed later.
Booleans cannot be converted to other types. For the other primitive types (char, byte, short, int, long, float, and double), there are two kinds of conversion: implicit and explicit.
Implicit conversions:
An implicit conversion means that a value of one type is changed to a value of another type without any special directive from the programmer. A char can be implicitly converted to an int, a long, a float, or a double. For example, the following will compile without error:
char c = 'a';
int k = c;
long x = c;
float y = c;
double d = c;
For the other (numeric) primitive types, the basic rule is that implicit conversions can be done from one type to another if the range of values of the first type is a subset of the range of values of the second type. For example, a byte can be converted to a short, int, long or float; a short can be converted to an int, long, float, or double, etc.
Explicit conversions:
Explicit conversions are done via casting: the name of the type to which you want a value converted is given, in parentheses, in front of the value. For example, the following code uses casts to convert a value of type double to a value of type int, and to convert a value of type double to a value of type short:
double d = 5.6; int k = (int)d; short s = (short)(d * 2.0);
Casting can be used to convert among any of the primitive types except boolean. Note, however, that casting can lose information; for example, floating-point values are truncated when they are cast to integers (e.g., the value of k in the code fragment given above is 5), and casting among integer types can produce wildly different values (because upper bits, possibly including the sign bit, are lost).
What are interpreted and compiled languages? Give examples (5)
Answer:
n an interpreted environment, the instructions are executed immediately after parsing. Both tasks are performed by the interpreter. Interpreted languages include the MS-Dos Batch language (the OS itself is the interpreter), shell scripts in Unix/Linux systems, Java, Perl and BASICA (a very old BASIC language). Advantages of interpreted languages include relative ease of programming (since once you type your instructions into a text file, the interpreter can run it) and no linker is required. Disadvantages include poor speed performance and that you do not generate an executable (and therefore distributable) program. The interpreter must be present on a system to run the program.
Modern programming contexts like ‘virtual machines’ managed frameworks are essentially interpreters. These are designed so that any architecture specific information is handled by the virtual machine, allowing the same source code to run on any type of platform.
Compilers parse the instructions into machine code and store them in a separate file for later execution. Many modern compilers can compile (parse) and execute in memory, giving the ‘appearance’ of an interpreted language. However, the key difference is that parsing and execution occurs in two distinct steps. Examples include newer forms of BASIC (such as Visual Basic), C/C++, Delphi and many others. In a compiled environment, you may speak of several separate files: source code (the text instructions you actually enter), object code (the parsed source code) and the executable (the linked object code). There is definitely an increase in complexity in using compilers, but the key advantages are speed performance and that you can distribute stand-alone executables.
Whether using a compiled or interpreted language, you will likely need a text editor in which to enter your instructions. Many compilers come complete with integrated editors optimized for working with the specific language. Using these editors is really not much different from using general text editing tools and word processors, though they may look quite different. One key point here is that so long as you follow the proper format requirements for a given interpreter or compiler, you can use any text editor you chose to construct and edit your source code.
Differentiate between client side scripting and server side scripting languages? (5)
Answer:
JavaScript – client side scripting
Primary objective of JavaScript is to create dynamic HTML documents and check validity of input forms. It is usually embedded in an HTML document. It is not really related to Java
PHP (Personal Home Page) – server-side scripting
It is interpreted on the Web Server when the HTML document in which embedded is requested by the browser. It often produces HTML code as an output and is very similar to JavaScript. It allows simple access to HTML form data and makes form processing easy. It also provides support for many different database management systems and hence provides Web access to databases.
Describe the programming steps in Prolog? (5)
Answer:
PROLOG programming follows the following steps:
¬ Declaring some facts about objects and their relationships
¬ Defining some rules about objects and their relationships
¬ Asking questions about objects and their relationships
Explain the Prolog features regarding its applications in real world. (5)
Answer:
You can find PROLOG in areas like expert systems or theorem provers construction. The variant of PROLOG called DATALOG is used in database management.
Prolog is a declarative programming language where we only specify what we need rather than how to do it. It has a simple concise syntax with built-in tree formation and backtracking which generates readable code which is easy to maintain. It is relatively case and type insensitive and is suitable for problem solving / searching, expert systems / knowledge representation, language processing / parsing and NLP, and game playing.
Efficiency is definitely is negative point. While writing programs one has to be aware of the left recursion, failing to do that may result in infinite loops. It has a steep learning curve and suffers from lack of standardization
Define and explain “throws Clause” and the “finally Clause” with respect to exception handling in Java. (5)
Answer:
Throws Clause
Throws clause is overloaded in C++ and conveys two different meanings: one as specification and the other as command. Java is similar in syntax but different in semantics. The appearance of an exception class name in the throws clause of Java method specifies that the exception class or any of its descendents can be thrown by the method.
A C++ program unit that does not include a throw clause can throw any exceptions. A Java method that does not include a throws cannot throw any checked exception it does not handle. A method cannot declare more exceptions in its throws clause than the methods it overrides, though it may declare fewer. A method that does not throw a particular exception, but calls another method that could throw the exception, must list the exception in its throws clause.
The finally clause
A Java exception handler may have a finally clause. A finally clause always executes when its try block executes (whether or not there is an exception). The finally clause is written as shown below:
try {
…
}
catch (…) {
…
}
…
finally {
…
}
A finally clause is usually included to make sure that some clean-up (e.g., closing opened files) is done. If the finally clause includes a transfer of control statement (return, break, continue, throw) then that statement overrides any transfer of control initiated in the try or in a catch clause.
23. How do Ada and COBOL differ by syntax and semantics in referencing a record element? Give examples of each (5)
Answer:
Prolog learning curve is very high meanings of this statement 3marks
Prolog is a declarative programming language where we only specify what we need rather than how to do it. It has a simple concise syntax with built-in tree formation and backtracking which generates readable code which is easy to maintain. It is relatively case and type insensitive and is suitable for problem solving / searching, expert systems / knowledge representation, language processing / parsing and NLP, and game playing.
Efficiency is definitely is negative point. While writing programs one has to be aware of the left recursion, failing to do that may result in infinite loops. It has a steep learning curve and suffers from lack of standardization
Short circuiting in java and c and c++ 3marks
Short Circuit Evaluation
A and B
A or B
Example
index := 1;
while (index <= length) and
(LIST[index] <> value) do
index := index + 1
C, C++, and Java: use short-circuit evaluation for
the usual Boolean operators (&& and ||), but
also provide bitwise Boolean operators that are
not short circuit (& and |)
How to define PHP classes
Classes and objects are similar to Java. A variable of the desired type is created with the new operator. It supports Single inheritance only and uses the keyword extends to inherit from a super class. The inherited methods and members can be overridden, unless the parent class has defined a method as final.
Union in c++ and java difference
C and C++ have free unions (no tags)
- Not part of their records
- No type checking of references
Java has neither records nor unions
Structs c++ and c#
structs are public by default. Structs are basically “objects” that contain variables inside of them.
The struct type: In C#, a struct is a value type.
What are subprogram issues in different languages?
Answer:
• What parameter passing methods are provided?
• Are parameter types checked?
• Are local variables static or dynamic?
• Can subprograms be overloaded?
• Can subprogram be generic?
What is seal struct and abstract in C#
Answer:
¥ Abstract: A class declared as ‘abstract’ cannot itself be instanced - it is designed only to be a base class for inheritance.
¥ Sealed: A class declared as ‘sealed’ cannot be inherited from. It may be noted that structs can also not be inherited from.
Two difference b/w c and c++
Answer:
• In c declaring the global variable several times is allowed but this is not allowed in c++.
• In c a character constant is automatically elevated to an integer whereas in c++ this is not the case.
• C structures have a different behavior compared to c++ structures. Structures in c do not accept functions as their parts.
Two difference b/w c++ and java
Answer:
C++ is a very capable and popular programming language while Java is a more recent programming language that maximizes the code’s portability.
Programs written in C++ are much faster compared to those written in Java.
C++ is commonly used for traditional computer programs while Java is primarily used for making online and mobile phone applications
What is monitor in java thread
Answer:
To prevent problems that could occur by having two methods modifying the same object, Java uses monitors and the synchronized keyword to control access to an object by a thread. Any object that implements the “synchronized” keyword is considered to be a monitor. A monitor is an object that can move a thread process between a blocked and running state. Monitors are required when a process needs to wait for an external event to occur before thread processing can continue. A typical example is when a thread can’t continue until an object reaches a certain state.
What is notify and wait in java
Answer:
Threads are based upon the concept of a Monitor. The wait and notify methods are used just like wait and signal in a Monitor. They allow two threads to cooperate and based on a single shared lock object.
There is a slight difference between notify and notifyAll. As the name suggest, notify() wakes up a single thread which is waiting on the object’s lock. If there is more than one thread waiting, the choice is arbitrary i.e. there is no way to specify which waiting thread should be re-awakened. On the other hand, notifyAll() wakes up ALL waiting threads; the scheduler decides which one will run.
What queried in prolog
Answer:
Queries are used to retrieve information from the database. A query is a pattern that PROLOG is asked to match against the database and has the syntax of a compound query. It may contain variables. A query will cause PROLOG to look at the database, try to find a match for the query pattern, execute the body of the matching head, and return an answer.
What is quoted atom in prolog?
Answer:
• Alphanumeric atoms - alphabetic character sequence starting with a lower case letter. Examples: apple a1 apple_cart
• Quoted atoms - sequence of characters surrounded by single quotes. Examples: ‘Apple’ ‘hello world’
• Symbolic atoms - sequence of symbolic characters. Examples: & < > * - + >>
{}
What is managed code?
Answer:
Managed code
Managed code is executed under the control of Common Language Runtime (CRL).
It has automatic garbage collection. That is, the dynamically allocated memory area which is no longer is in use is not destroyed by the programmer explicitly. It is rather automatically returned back to heap by the built-in garbage collector. There is no explicit memory’s allocation and deallocation and there is no explicit call to the garbage collector.
Unmanaged code
The unmanaged code provides access to memory through pointers just like C++. It is useful in many scenarios. For example:
¥ Pointers may be used to enhance performance in real time applications.
¥ In non-.net DLLs some external functions requires a pointer as a parameter, such as Windows APIs that were written in C.
¥ Sometimes we need to inspect the memory contents for debugging purposes, or you might need to write an application that analyzes another application process and memory.
How many ways the static binding can be define
Answer:
Static and Dynamic Binding
A binding is static if it occurs before run time and remains unchanged throughout program execution
A binding is dynamic if it occurs during execution or can change during execution of the program
If static, type may be specified by either an explicit or an implicit declaration
An explicit declaration is a program statement used for declaring the types of variables
An implicit declaration is a default mechanism for specifying types of variables (the first appearance of the variable in the program)
Explain Stack Dynamic variable with example? 5
Answer:
• Fixed stack dynamic - range of subscripts is statically bound, but storage is bound at elaboration time e.g. C local arrays are not static
• Advantage: space efficiency
• Stack-dynamic - range and storage are dynamic, but fixed from then on for the variable’s lifetime e.g. Ada declare blocks declare
STUFF : array (1…N) of FLOAT;
begin
…
end;
Advantage: flexibility - size need not be known until the array is about to be used
Discuss the problem of Aliasing in JavaScript with a proper example? 5 + bad aspects of past multiple selectors? 3
Answer:
Aliasing Problems in Java
The fact that arrays and classes are really pointers in Java can lead to some problems. Here is a simple assignment that causes aliasing:
int [] A = new int [4];
Int [] B = new int [2];
This is depicted as below:
Now, when we say:
A[0] = 5;
We get the following:
Now when we say:
B = A;
B points to the same array as A and creates an alias. This is shown below:
Now if we make a simple assignment in B, we will also change A as shown below:
B[0] = 10;
This obviously creates problems. Therefore, as a programmer you have to be very careful when writing programs in Java.
In Java, all parameters are passed by value, but for arrays and classes the actual parameter is really a pointer, so changing an array element, or a class field inside the function does change the actual parameter’s element or field.
This is elaborated with the help of the following example:
A ) {
A[0] = 10; // change an element of parameter A
A = null; // change A itself
}
void g() {
B = new int [3];
B[0] = 5;
f(B);
// B is not null here, because B itself was passed by value
// however, B[0] is now 10, because function f changed the
// first element of the array
}
Java has a String class which is not exactly an array of
►Char
►Elements
►Indices
►Long
How many string operators are in PHP?
►2
►3
►4
►10
If you want an argument to a function to always be passed by reference, you can prepend
►Percentage sign (%) to the argument name in the function definition
►Dollar sign ($)to the argument name in the function definition
►An ampersand (&) to the argument name in the function definition
►Tilled sign (~)to the argument name in the function definition
How many modes for the source code are in C#?
►One
►Two
►Three
►Four
Which chaining type is used by Prolog?
►Backward
►Forward
►Up
►Horizontal
What are the enumeration and subrange types? Differentiate these two in points.
An enumeration is a special kind of value type limited to a restricted and unchangeable set of numerical values. By default, these numerical values are integers, but they can also be longs, bytes, etc. (any numerical value except char)
a) What is the purpose of type conversion? (5)
Converting one type of data to another is both useful and a source of numerous errors in JavaScript.
b) Differentiate between the implicit and explicit type conversion with respect to Java. (5)
Question No: 9 ( Marks: 10 )
a) What are interpreted and compiled languages? Give examples (5)
Prolog It is an interactive (hybrid compiled/interpreted) language.
PHP is interpreted
FORTAN is compiled
SNOBAL is compiled
b) Differentiate between client side scripting and server side scripting languages? (5)
JavaScript – client side scripting
Primary objective of JavaScript is to create dynamic HTML documents and check validity of input forms. It is usually embedded in an HTML document. It is not really related to Java
PHP (Personal Home Page) – server-side scripting
It is interpreted on the Web Server when the HTML document in which embedded is requested by the browser. It often produces HTML code as an output and is very similar to JavaScript. It allows simple access to HTML form data and makes form processing easy. It also provides support for many different database management systems and hence provides Web access to databases.
Question No: 10 ( Marks: 10 )
a) Describe the programming steps in Prolog? (5)
PROLOG programming follows the following steps:
• Declaring some facts about objects and their relationships
• Defining some rules about objects and their relationships
• Asking questions about objects and their relationships
b) Explain the Prolog features regarding its applications in real world. (5)
One of the main features of this language is its ability to handle and process symbols.
Hence it is used heavily in AI related applications. It is an interactive (hybrid
compiled/interpreted) language and its applications include expert systems, artificial intelligence, natural language understanding, logical puzzles and games.
Ada pointers are called Access types.
TRUE
FALSE
a) Comparison between functional and imperative languages?
Differentiate between the Dynamic Type binding and Static type binding?
Static and Dynamic Binding
A binding is static if it occurs before run time and remains unchanged throughout
program execution
A binding is dynamic if it occurs during execution or can change during execution
of the program
Dynamic binding occurs at:
Compile Time
Design Time
Link Time
Run Time
Convert the following Ada code into equivalent C code.
case ch is
when ‘A’ | ‘E’ | ‘I’ | ‘O’ | ‘U’ =>
putline(“this is an uppercase vowel”);
when ‘J’ … ‘N’ =>
putline(“between uppercase J and N”);
when others =>
putline(“something else”);
end case;
The dangling pointer problem is partially alleviated by Ada design.
TRUE
FALSE
Which statement is wrong about Static variables?
They are bound to memory cells before the execution of program
They use to direct access the memory.
There is run time overhead of allocation and de-allocation of memory.
Storage can’t be shared among variables
Prolog language falls under the domain of:
Scientific Applications
Business Applications
Special Purpose Languages
None of these
Following statement returns the union of the two list in LISP. Select correct option: >(L1 UNION L2) >(union L1 L2) (answer) >Union L1 >(L1 union L2) Question # 2 of 10 ( Start time: 01:23:17 PM ) Total Marks: 1 Following is the correct structure of a “block” in Ada. Select correct option: declare – declare section optional statements begin declarations exception – exception section optional handlers end; declare – declare section optional declarations begin statements (answer) exception – exception section optional handlers end; declare – declare section optional statements begin declarations handlers exception – exception section optional end; declare – declare section optional statements declarations begin statements exception – exception section optional handlers end; Question # 3 of 10 ( Start time: 01:24:33 PM ) Total Marks: 1 In LISP, ___________ is the main tool used for iteration. Select correct option: Recursion (answer) For Loop While Loop Do-While Loop Question # 4 of 10 ( Start time: 01:25:35 PM ) Total Marks: 1 ___________ represents the class of languages from functional paradigm. Select correct option: LISP (answer) PROLOG Ada C++ ) Question # 5 of 10 ( Start time: 01:27:00 PM ) Total Marks: 1 In LISP, following statement returns the difference of the two lists. Select correct option: (Difference L1 L2) (set-difference L1 L2) (answer) (L1 Difference L2) (L1 difference L2) Question # 6 of 10 ( Start time: 01:27:52 PM ) Total Marks: 1 Lists can be constructed with the help of three basic functions which are ___________. Select correct option: scheme, common lisp and cons cons, append and scheme cons, list and append (answer) list, atoms and append Question # 7 of 10 ( Start time: 01:29:07 PM ) Total Marks: 1 Block statement in Ada is very different to a block in C. Select correct option: True False (answer) Question # 8 of 10 ( Start time: 01:29:42 PM ) Total Marks: 1 Two important versions of LISP are _________________. Select correct option: Scheme and Atoms Scheme and Common Lisp (answer) Common Lisp and defacto List and Common Lisp Question # 9 of 10 ( Start time: 01:30:47 PM ) Total Marks: 1 Following is the correct syntax of ‘for’ statement in Ada. Select correct option: for variable in low_value … high_value loop – Loop body goes here end loop; (answer) for variable in low_value … high_value loop – Loop body goes here end; begin; for variable in low_value … high_value loop – Loop body goes here end loop; begin loop; for variable in low_value … high_value loop – Loop body goes here end loop; Question # 10 of 10 ( Start time: 01:31:56 PM ) Total Marks: 1 In __________, Enumeration type can also be used as indexes in arrays. Select correct option: Ada C C++ LISP (answer not confirmed) Question # 1 of 15 ( Start time: 08:30:41 AM ) Total Marks: 1 SNOBOL was designed for ___________ purpose. Select correct option: String manipulation AI Business Scientific Question # 2 of 15 ( Start time: 08:31:21 AM ) Total Marks: 1 Pattern . Variable Upon successful completion of pattern matching, the substring matched by the pattern is assigned to the variable as ________ Select correct option: Value String Integer Real numbers Question # 3 of 15 ( Start time: 08:32:10 AM ) Total Marks: 1 Computer architecture has a major influence on the design of programming language. Select correct option: *** True False Question # 4 of 15 ( Start time: 08:33:23 AM ) Total Marks: 1 Too much simplicity in language design can also cause problems. Select correct option: True False Question # 5 of 15 ( Start time: 08:33:58 AM ) Total Marks: 1 A language evaluation criteria includes following factors EXCEPT Select correct option: Readability Writabilty Portability Modularity Question # 6 of 15 ( Start time: 08:35:16 AM ) Total Marks: 1 COBOL is mainly designed for _______. Select correct option: Scientific experiments Business application AI applications Publishing and writing algorithm Question # 7 of 15 ( Start time: 08:36:25 AM ) Total Marks: 1 The variable name have profound effect on _______________. Select correct option: Readability Writability * Orthogonality Portability Question # 8 of 15 ( Start time: 08:37:48 AM ) Total Marks: 1 SIZE function in SONOBOL language is used to return the size of __ Select correct option: String Operator Variable Keyword Question # 9 of 15 ( Start time: 08:38:52 AM ) Total Marks: 1 Indirect referencing in f is same as of _____in C. Select correct option: Arrays Pointers Aliasing Stack
Question # 10 of 15 ( Start time: 08:40:12 AM ) Total Marks: 1 Following factors influences a portable language design EXCEPT Select correct option: Computer architecture Readability Programmer’s time Windows XP Question # 11 of 15 ( Start time: 08:41:32 AM ) Total Marks: 1 The more is the Simplicity of a language, the more it will always be readable. Select correct option: True False Question # 12 of 15 ( Start time: 08:41:48 AM ) Total Marks: 1 + Sign is used for _______ in SONOBOL. Select correct option: Line Continuation Line Breakage Question # 13 of 15 ( Start time: 08:42:56 AM ) Total Marks: 1 Which of the following is an incorrect option from the following statements regarding ‘objectives of learning new languages ’? Select correct option: Help to compare different languages. Help in transition from one language to other language. Help in understanding the language piracy policy. Help to choose a language for development of a certain application. Question # 14 of 15 (Start time: 08:43:31 AM ) Total Marks: 1 was the first object oriented language. Select correct option: COBOL LISP JAVA ****SIMULA Question # 15 of 15 ( Start time: 08:44:22 AM ) Total Marks: 1 In SONOBOL 2 spaces can be used, the purpose of 1st space is for ____ and 2nd for Select correct option:
*** Pattern matching, String Concatenation String concatenation, Pattern matching
Quiz Start Time: 06:16 PM Time Left 88 sec(s) Question # 1 of 15 ( Start time: 06:16:16 PM ) Total Marks: 1 In C# Managed code is executed under the control of Select correct option: CLR CRL Quiz Start Time: 06:16 PM Time Left 89 sec(s) Question # 2 of 15 ( Start time: 06:16:34 PM ) Total Marks: 1 _____is more strongly typed language then Select correct option: C++, C# C#, C++ C++, Java None of then given Quiz Start Time: 06:16 PM Time Left 61 sec(s) Question # 3 of 15 ( Start time: 06:17:30 PM ) Total Marks: 1 The IS operator in C# is used for_________ Select correct option: Run time type conversion Run time type checking not confirmed Run time type casting None of the given Quiz Start Time: 06:16 PM Time Left 81 sec(s) Question # 5 of 15 ( Start time: 06:18:35 PM ) Total Marks: 1 compile into machine independent language, independent code which run in a managed execution environment. Select correct option: C# Java C++ Ada Quiz Start Time: 06:16 PM Time Left 82 sec(s) Question # 6 of 15 ( Start time: 06:19:44 PM ) Total Marks: 1 PHP supported all major Databases including. Select correct option: ODBC Oracle SQL Server None Of given Quiz Start Time: 06:16 PM Time Left 81 sec(s) Question # 7 of 15 ( Start time: 06:20:42 PM ) Total Marks: 1 ______compile initially to an intermediate. Which can be run by interpretation or just in time compilation or an appropriate virtual machine? Select correct option: C++ and C# C# and Java Java and C++ Ada , C++ Quiz Start Time: 06:16 PM Time Left 89 sec(s) Question # 8 of 15 ( Start time: 06:21:16 PM ) Total Marks: 1 The keyword unsafe is used while dealing with_____ Select correct option: Loop Arrays Pointers Classes Quiz Start Time: 06:16 PM Time Left 89 sec(s) Question # 9 of 15 ( Start time: 06:21:26 PM ) Total Marks: 1 Enumeration type in C# may take any type of _______ in contrast to C++ where it take only _______ Select correct option: Numeric value, integer value Value type value, numeric value Primitive type value, reference type value Value type value, reference type value Quiz Start Time: 06:16 PM Time Left 89 sec(s) Question # 13 of 15 ( Start time: 06:23:46 PM ) Total Marks: 1 The concept of sealed class in C# is similar to Select correct option: Struct in C#, Struct in C++ Abstract class in C# None of the given s Question # 14 of 15 ( Start time: 06:24:03 PM ) Total Marks: 1 Managed or safe code in is executed under the control of common language runtime (CLR) with automatic garbage collection, no explicit memory allocation and de allocation and no explicit destructor. Select correct option: C++ Java Ada and C++ C# Question # 15 of 15 ( Start time: 06:24:19 PM ) Total Marks: 1 In C# the if statement condition is an/a Select correct option: Arithmetic expression Boolean expression Numeric expression Both Numeric expression and Boolean expression Quiz Start Time: 06:27 PM Time Left 89 sec(s) Question # 1 of 15 ( Start time: 06:27:47 PM ) Total Marks: 1 Java code when compiled is converted into ________ code. Select correct option: Bit code Byte code Kbytes code Giga byte Code Quiz Start Time: 06:27 PM Time Left 89 sec(s) Question # 2 of 15 ( Start time: 06:27:59 PM ) Total Marks: 1 PHP is a typed language. Select correct option: Strongly Dynamic Static None of Given Quiz Start Time: 06:27 PM Time Left 89 sec(s) Question # 3 of 15 ( Start time: 06:28:10 PM ) Total Marks: 1 In ______ the relationship between a get and set method is inherited, while in ___________ it has to be maintained. Select correct option: Java , C++ C++ , C# Ada , Java C# , Java or C++ Quiz Start Time: 06:27 PM Time Left 86 sec(s) Question # 4 of 15 ( Start time: 06:31:18 PM ) Total Marks: 1 C# code when compiled is converted into ________ code. Select correct option: MSIL MISL Quiz Start Time: 06:27 PM Time Left 89 sec(s) Question # 5 of 15 ( Start time: 06:31:28 PM ) Total Marks: 1 In Boolean expression is convertible into integer type. Select correct option: C# C++ JAVA Ada Question # 6 of 15 ( Start time: 06:32:04 PM ) Total Marks: 1 PHP syntax looks like Select correct option: ASP syntax C/C++ syntax Quiz Start Time: 06:27 PM Time Left 89 sec(s) Question # 7 of 15 ( Start time: 06:32:12 PM ) Total Marks: 1 For narrowing conversion which type conversion is appropriate? Select correct option: Implicit Conversion Explicit Conversion Question # 8 of 15 ( Start time: 06:32:19 PM ) Total Marks: 1 In Java we can make pointer of. Select correct option: Any type Reference type only Quiz Start Time: 06:27 PM Time Left 89 sec(s) Question # 9 of 15 ( Start time: 06:32:31 PM ) Total Marks: 1 In C# the value type and reference type variable are interconvert able through ________ concept. Select correct option: Tagged type Boxing Interfaces None of the given Quiz Start Time: 06:27 PM Time Left 89 sec(s) Question # 10 of 15 ( Start time: 06:32:43 PM ) Total Marks: 1 C# support only inheritance and it achieve inheritance through the concept of interfaces. Select correct option: Multiple, multiple Single, multiple Quiz Start Time: 06:27 PM Time Left 89 sec(s) Question # 11 of 15 ( Start time: 06:32:54 PM ) Total Marks: 1 Tasks in ____are processes and cannot share data but thread in _______ do it. Select correct option: C# , C++ C++ , Ada Java , C# Ada , Java Question # 12 of 15 ( Start time: 06:33:03 PM ) Total Marks: 1 The concept of package in Java is similar to _________ Select correct option: Assembly in C# Global class in C# Question # 13 of 15 ( Start time: 06:33:36 PM ) Total Marks: 1 The concept of C# jagged array is similar in function to _________ Select correct option: C++ rectangular Array Java Array of Array Java pointer Array C# Array Question # 14 of 15 ( Start time: 06:34:17 PM ) Total Marks: 1 In C# _____can be inherited from other class but no inheritance from it. On the other hand _________ cannot be inherited not inheritance is possible from it is possible. Select correct option: Private class , public class Sealed class ,struct in C# struct in C# , Sealed class public class , inherited class Quiz Start Time: 06:27 PM Time Left 89 sec(s) Question # 15 of 15 ( Start time: 06:34:49 PM ) Total Marks: 1 The concept of sealed class in C# is similar to ________ Select correct option: Struct in C#, Struct in C++ Abstract class in C# None of the given
CS 508 mid term spring 2010 paper
Compare ADA dor loop with dolist and dotime in LISP (5)
Apart from recursion, in LISP we can write code involving loops using iterative non recursive mechanism. There are two basic statements for that purpose: dotimes and dolist.
DOTIMES
dotimes is like a counter-control for loop. Its syntax is given as below:
(dotimes (count n result) body)
It executes the body of the loop n times where count starts with 0, ends with n-1.
The result is optional and is to be used to hold the computing result. If result is given, the function will return the value of result. Otherwise it returns NIL. The value of the count can be used in the loop body.
DOLIST
The second looping structure is dolist. It is used to iterate over the list elements, one at a time. Its syntax is given below:
(dolist (x L result) body)
It executes the body for each top level element x in L. x is not equal to an element of L in each iteration, but rather x takes an element of L as its value. The value of x can be used in the loop body. As we have seen in the case of dotimes, the result is optional and is to be used to hold the computing result. If result is given, the function will return the value of result. Otherwise it returns NIL.
Differentiate between ADA access types and C/C++ pointer type (5)
An access type roughly corresponds to a C++ pointer.
type Address_Ref is access Address;
A_Ref := new Address;
A_Ref.Postal_Code := “94960-1234”;
Note that, unlike C, there is no notational difference for accessing a record field directly or through an access value.
To refer to the entire record accessed by an access value use the following notation:
Print(A_Ref.all);
Why predicate is a special function in LISP (3)
A predicate is a special function which returns NIL if the predicate is false, T or anything other than NIL, otherwise. Predicates are used to build Boolean expressions in the logical statements.
The following comparative operators are used as functions for numerical values and return a T or NIL. =, >, <, >=, <=;
Differentiate between C/C++ unions and ADA discriminated type (3)
Discriminated records are like union types in C. There are however major differences between C union types and Ada discriminated records. The union type in C is fundamentally unsafe, and therefore unacceptable.
What additional features are added in COBOL (2)
COBOL uses level numbers to show nested records; others use recursive definitions Business applications
reports, decimal arithmetic, character operations - COBOL
It was designed to look like simple English to broaden the base of computer users.
Is there anything like templates as in C++ (2)
Generics are like templates in C++ and allow parameterization of subprograms and packages with parameters which can be types and subprograms as well as values and objects.
Anything starting with Capital or underscore is a variable in ____________(Prolog, Lisp, Cobol)
In Prolog we specify ______ and not ______ (solution, problem)
LISP is used in _______ and _______(functional paradigm, AI)
First arguments in LISP is __________ (Atom, argument, integer, LIST)
ADA has ____ do while loop as C/C++ (NO, effective, similar)
Maps in SNOBOL are also available in ____(C, C++, MATLAB, Prolog)
We use ____ indirect referencing operator in SNOBOL (Binary “.”, Binary $, Unary “.”, Unary $)
Elementary types are also called __________ in ADA (Static, user defines, builtin)
ADA is a _____typed language (strongly)
In Snobol 2 spaces are used for , 1st for ______, 2nd for _________
______ has elaborated exception handling (ADA, C++, JAVA, COBOL)
___ has a powerful set of operators but poor type checking (C, C++, ADA, LISP)
______and _______ have declaration paradigm (Prolog, SQL)
1st machine independent language is _______ sonobol
To make necessary arguments at run time error is called __(exception handling)
Language with wide domain of application has higher(generality)
_____ has distributed computing architecture (COBRA)
Readability has no influence on the cost of _________(deployment)
The depth at which we can think is influenced by _________(implementation details)
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Quiz Start Time: 10:23 PM
Time Left
45 sec(s)
Question # 2 of 10 ( Start time: 10:25:12 PM )
Total Marks: 1
In SONOBOL 2 spaces can be used, the purpose of 1st space is for _____ and 2nd for
Select correct option:
Correct
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In SONOBAL binary operators have atleast____ spaces
1
2
3
4
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Quiz Start Time: 10:23 PM
Time Left
5 sec(s)
Question # 3 of 10 ( Start time: 10:26:31 PM )
Total Marks: 1
Sign is used for _______ in SONOBOL.
Select correct option:
Correct
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Quiz Start Time: 10:23 PM
Time Left
27 sec(s)
Question # 4 of 10 ( Start time: 10:28:01 PM )
Total Marks: 1
In SONOBOL can the size of the array be determined at run time.
Select correct option:
Correct
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Quiz Start Time: 10:23 PM
Time Left
23 sec(s)
Question # 5 of 10 ( Start time: 10:29:17 PM )
Total Marks: 1
___________ is an important feature of Ada language used in embedded systems and operating systems. It is used in managing parallel threads of controls.
Select correct option:
Correct
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Quiz Start Time: 10:23 PM
Time Left
8 sec(s)
Question # 6 of 10 ( Start time: 10:30:34 PM )
Total Marks: 1
One of the major design goals of Ada was
Select correct option:
Correct
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Quiz Start Time: 10:23 PM
Time Left
29 sec(s)
Question # 7 of 10 ( Start time: 10:32:03 PM )
Total Marks: 1
SONOBOL is case _______
Select correct option:
Correct
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Quiz Start Time: 10:23 PM
Time Left
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Question # 8 of 10 ( Start time: 10:33:29 PM )
Total Marks: 1
The main design goals of Ada were EXCEPT
Select correct option:
Correct
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Quiz Start Time: 10:23 PM
Time Left
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Question # 9 of 10 ( Start time: 10:34:48 PM )
Total Marks: 1
The space operator has _____ precedence than arithmetic operators.
Select correct option:
Correct
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Time Left
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Question # 10 of 10 ( Start time: 10:35:28 PM )
Total Marks: 1
Pattern . Variable Upon successful completion of pattern matching, the substring matched by the pattern is assigned to the variable as ________
Select correct option:
Correct
What are subprogram issues in different languages?
Answer:
• What parameter passing methods are provided?
• Are parameter types checked?
• Are local variables static or dynamic?
• Can subprograms be overloaded?
• Can subprogram be generic?
What is seal struct and abstract in C#
Answer:
¥ Abstract: A class declared as ‘abstract’ cannot itself be instanced - it is designed only to be a base class for inheritance.
¥ Sealed: A class declared as ‘sealed’ cannot be inherited from. It may be noted that structs can also not be inherited from.
Two difference b/w c and c++
Answer:
• In c declaring the global variable several times is allowed but this is not allowed in c++.
• In c a character constant is automatically elevated to an integer whereas in c++ this is not the case.
• C structures have a different behavior compared to c++ structures. Structures in c do not accept functions as their parts.
Two difference b/w c++ and java
Answer:
C++ is a very capable and popular programming language while Java is a more recent programming language that maximizes the code’s portability.
Programs written in C++ are much faster compared to those written in Java.
C++ is commonly used for traditional computer programs while Java is primarily used for making online and mobile phone applications
What is monitor in java thread
Answer:
To prevent problems that could occur by having two methods modifying the same object, Java uses monitors and the synchronized keyword to control access to an object by a thread. Any object that implements the “synchronized” keyword is considered to be a monitor. A monitor is an object that can move a thread process between a blocked and running state. Monitors are required when a process needs to wait for an external event to occur before thread processing can continue. A typical example is when a thread can’t continue until an object reaches a certain state.
What is notify and wait in java
Answer:
Threads are based upon the concept of a Monitor. The wait and notify methods are used just like wait and signal in a Monitor. They allow two threads to cooperate and based on a single shared lock object.
There is a slight difference between notify and notifyAll. As the name suggest, notify() wakes up a single thread which is waiting on the object’s lock. If there is more than one thread waiting, the choice is arbitrary i.e. there is no way to specify which waiting thread should be re-awakened. On the other hand, notifyAll() wakes up ALL waiting threads; the scheduler decides which one will run.
What queried in prolog
Answer:
Queries are used to retrieve information from the database. A query is a pattern that PROLOG is asked to match against the database and has the syntax of a compound query. It may contain variables. A query will cause PROLOG to look at the database, try to find a match for the query pattern, execute the body of the matching head, and return an answer.
What is quoted atom in prolog?
Answer:
• Alphanumeric atoms - alphabetic character sequence starting with a lower case letter. Examples: apple a1 apple_cart
• Quoted atoms - sequence of characters surrounded by single quotes. Examples: ‘Apple’ ‘hello world’
• Symbolic atoms - sequence of symbolic characters. Examples: & < > * - + >>
{}
What is managed code?
Answer:
Managed code
Managed code is executed under the control of Common Language Runtime (CRL).
It has automatic garbage collection. That is, the dynamically allocated memory area which is no longer is in use is not destroyed by the programmer explicitly. It is rather automatically returned back to heap by the built-in garbage collector. There is no explicit memory’s allocation and deallocation and there is no explicit call to the garbage collector.
Unmanaged code
The unmanaged code provides access to memory through pointers just like C++. It is useful in many scenarios. For example:
¥ Pointers may be used to enhance performance in real time applications.
¥ In non-.net DLLs some external functions requires a pointer as a parameter, such as Windows APIs that were written in C.
¥ Sometimes we need to inspect the memory contents for debugging purposes, or you might need to write an application that analyzes another application process and memory.
How many ways the static binding can be define
Answer:
Static and Dynamic Binding
A binding is static if it occurs before run time and remains unchanged throughout program execution
A binding is dynamic if it occurs during execution or can change during execution of the program
If static, type may be specified by either an explicit or an implicit declaration
An explicit declaration is a program statement used for declaring the types of variables
An implicit declaration is a default mechanism for specifying types of variables (the first appearance of the variable in the program)
Explain Stack Dynamic variable with example? 5
Answer:
• Fixed stack dynamic - range of subscripts is statically bound, but storage is bound at elaboration time e.g. C local arrays are not static
• Advantage: space efficiency
• Stack-dynamic - range and storage are dynamic, but fixed from then on for the variable’s lifetime e.g. Ada declare blocks declare
STUFF : array (1…N) of FLOAT;
begin
…
end;
Advantage: flexibility - size need not be known until the array is about to be used
Discuss the problem of Aliasing in JavaScript with a proper example? 5 + bad aspects of past multiple selectors? 3
Answer:
Aliasing Problems in Java
The fact that arrays and classes are really pointers in Java can lead to some problems. Here is a simple assignment that causes aliasing:
int [] A = new int [4];
Int [] B = new int [2];
This is depicted as below:
Now, when we say:
A[0] = 5;
We get the following:
Now when we say:
B = A;
B points to the same array as A and creates an alias. This is shown below:
Now if we make a simple assignment in B, we will also change A as shown below:
B[0] = 10;
This obviously creates problems. Therefore, as a programmer you have to be very careful when writing programs in Java.
In Java, all parameters are passed by value, but for arrays and classes the actual parameter is really a pointer, so changing an array element, or a class field inside the function does change the actual parameter’s element or field.
This is elaborated with the help of the following example:
A ) {
A[0] = 10; // change an element of parameter A
A = null; // change A itself
}
void g() {
B = new int [3];
B[0] = 5;
f(B);
// B is not null here, because B itself was passed by value
// however, B[0] is now 10, because function f changed the
// first element of the array
}
mcq were new from handouts 2 3 from past , 3 subjective Q were from past papers.
Q no 1 write the simple Ada program whether a number is event or not?
Q no 2 which data structre is more widely use in LISP pogramming.?
Qno 3 write the ada program of given arguments Use for loop and use Put() method execpt PUt_Line() and write NEW_Line for new line the arguments are given below
*
**
Q no 4 Set the value of variable a HEIGHT =12 and Weight=5.
Q no 5 dotime dolist men sy function tha koi ,
Q no 6 when Put_Line method is called in Ada does need to calL New_Line method or not?
FORTRAN men sy mcq thy , Lisp men sy thy , ada men sy thy sonobol men sy thy , First program jis ny error door kiye kon sa tha ,readabilty men sy thy , lisp k function kon kon sy hn , etc
2 questions of 5 marks
1.write code in LISP to compute power of x to y page 76
2. Write maps data types in SNOBOL.
3 marks questions
write IO header file for Ada…
name functions that are used in List construction
2 marks questions
What are operators for Logical AND && and Logical OR || used in ADA.
features added in COBOL not included in SNOWBOL.
for MCQs you need to read the book some are from old papers too but for good marks reading is
must.
Remember me in your Prayers
compared to students in a distance learning environment.
The key difference between Live learning and distance learning is geography. Students can be together with an instructor and use online learning, but distance learning implies that students and instructor are separated.
The big differences include:
Location
Interaction
Intention
A comparison of live and distance teaching and learning has been undertaken to ascertain the focal point that would justify the best-preferred option as far as teaching and learning in DE is concerned. This study is particularly important because as higher education institutions are faced with the challenge of huge number of prospective students seeking higher education in the midst of inadequate infrastructures, it becomes very necessary to look at DE as an option with a combination of different modes of delivering instruction. At the Virtual University of Pakistan, some faculties and departments, especially the distance education department, have adopted the live and online modes of delivering instruction. The pursuit of which would require a critical overview of the two modes to ascertain the strengths, weaknesses and how the two can complement each other for effective delivery of instruction to cater to a large number of students. The review suggested that academics or lecturers should endeavor to adopt the blended or hybrid mode in their teaching and learning. Policy decision makers can also use this study as it provides information on better practices as far as the blended mode of teaching and learning in higher education institutions is concerned.
We should only use the educational tools that fit your needs.
At the same time, we also believe that Live learning is superior to distance learning. But in a pinch, distance learning is still a good way to educate students.
Which of the following is preferable method for the long term storage of Microoraganisms?
Microbial resource centers and preservation research … Lyophilization is the preferred long-term preservation method in most MRCs due to the …
Lyophilization is the preferred long-term preservation method in most MRCs due to the low cost of maintenance and ease of transportation of lyophilized cultures. Lyophilization gives satisfactory results for the preservation of many bacteria, yeast and sporulating fungi, but does not adequately preserve non-sporulating fungi (vegetative hyphae), some species of yeast (Lipomyces, Leucosporidium, Brettanomyces, Dekkera, Bulleera, Sporobolomyces) and certain bacteria [Aquaspirillum serpens, Clostridium botulinum, Helicobacter pylori; Smith et al., 2008)]. Lyophilization exerts stress on the cells during vacuum desiccation, and cells raised under stress may respond better to lyophilization (Morgan et al., 2006; Smith et al., 2008). For instance, a culture at stationary phase and low pH condition survived better during lyophilization than did cells in log phase grown at circumneutral pH (Palmfeldt & Hahn-Hagerdal, 2000; Corcoran et al., 2004). However, the above-mentioned generalization is not true for all groups of bacteria (Boumahdi et al., 1999). In general, a suspension medium with 1 × 108 cell mL−1 or more gives a better recovery, whereas glass-forming cryoprotectants are preferred over a eutectic crystallization salt (palmfeldt et al., 2003; Morgan et al., 2006). Although techniques of lyophilization are well established, optimization of lyoprotectants and suspension media are still necessary for certain microorganisms (Crowe et al., 1998; Miyamoto-Shinohara et al., 2000; Carvalho et al., 2003; Gomez Zavaglia et al., 2003; Streeter, 2003; Berner & Viernstein, 2006; Tindall, 2007; Siaterlis et al., 2009). An ideal suspension medium for lyophilization should contain lyoprotectants and matrix materials or excipients. The use of stationary phase cultures, borosilicate ampules, a 1–2% final moisture content of the lyophilized specimen, and storage at 4 °C in the dark are recommended for higher cell viability and longer stability with lyophilization (Morgan et al., 2006; Smith et al., 2008).
Both cryopreservation and lyophilization have advantages and disadvantages, and the response of preservation varies by species. Even different strains of the same species may respond differently to the same preservation method. The viability and longevity of microorganisms under preservation depends on some critical factors: (1) composition of the suspension and rehydration medium, (2) type of cryoprotectant used, (3) rate of cooling and thawing, (4) growth stage of the culture, (5) cell size and type, lipid content, water content, and initial density of cells (De Kievit et al., 2001; Hubalek, 2003; Ren et al., 2004; Morgan et al., 2006; Smith et al., 2008; Chian, 2010) Reff
@zareen
The Linked List ADT
We have been using linked nodes to generate our structures for the Stack ADT and the Queue ADT. Now we will consider the linked list. As we have been using this structure for implementing the previous ADT structures, it is perhaps more constructive to look at a variation of the single linked list (known as the ‘sorted’ linked list).
The idea behind this type of list is that any element we put into the list will have to be put into the correct position by comparing some common value held in each of the nodes. So far the Stack ADT and the Queue ADT did not impose any ordering on the elements we added. If we were looking for a basic linked list, we could use these as the basis for the structure and operations. This is a task you might attempt for yourselves.
Our sorted linked list ADT will consist of the following primitive operations:
We would generally need a display operation for testing purposes to ensure that the elements are being put into the correct locations. However, the Sorted linked list is a linear structure so any processing done on the list has to be carried out in a linear manner. We must access the list through the Start link / pointer and the list has to be accessed/processed in the order that the nodes appear on the list.
As we have previously seen, one of the great advantages of the linked data structure is the ease with which it may be modified. Changing the structure does not involve moving the existing nodes. In order to delete a node we update the link / pointer of the node before it and point / link this to the node after it.
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