CS201 final exam past papers -vu knowledgeonline
Question 1:-
Identify each of the following as system software and application software. (mark 5) LINUX, DISK CLEANUP, WORD PROCESSOR, WINDOWS, STUDENT INFORMATION
Answer:-
System software: - Linux, Disk cleanup, windows.
Application software:- Word Processor, Student information
Question 2:-
Write a program which defines three variables of type double which store three different values including decimal points, using set precision manipulators to print all these values with different numbers of digits after the decimal number.(5)
Answer:-
#include #include
int main ()
{
double x1 = 12345624.72345
double x2 = 987654.12345
double x3 = 1985.23456
cout << setprecision (3) << x1<< endl;
cout << setprecision (4) << x2 << endl;
cout << setprecision (5) << x3<< endl;
return 0;
}
Question 3:-
Define static variable also explain life time of static variable? (3)
Answer:
Static variable means maintaining the state of a variable. It exists and lives around even when we are outside the function. It is created and initialized only once during the lifetime of the program and therefore it will be destroyed or taken out of memory only once during the lifetime of the program.
Question 4:-
What do you know about run time error? (3)
Answer:
Run-Time Errors
• Occur when the program is running and tries to do something that is against the 2 rules Example: Accessing a non-existent variable, property, method, object, etc (e.g. a method name is misspelled)
• Sources of these can be determined by a careful reading of the code, but unfortunately, not always
Question 5:
What is limitation of the friendship between classes? (3)
Answer:
Friendship relation between classes is a one way relation that is if one class declare friend another class then the another class is the friend of first class but not the first class if the friend of another class.
Question 6:
what is the source and destination of cin?(2)
Answer:
For cin, the source is normally keyboard and the destination can be an ordinary variable i.e. native-data type variable
Question 6:
Write the general syntax of allocation memory dynamically to an array using new operator? (2)
Answer: Page 332
Following is the syntax:
new data_type [number_of_locations];
Question 7:
What is diffrent between pointer and variable?
Answer:-
normal variable contains tha value of variable either int or float whereas pointer variable contains the address of another variable
Question 8:
What is difference between Unary and binary operators and how they can be overloaded?
Answer:-
Unary operator takes one argument.
a ++ is an example of unary operator
Binary take two operators
+,-,* are example of binary operators
Overloaded binary operator may return any type
Here is general syntax of overloading
Return-type operator symbol (parameters);
Operator is keyword
Question 9:
How many types of templates?
Answer:-
There are two different types of templates in C++ language i.e.’ function templates and class templates.
Question 10:
What will be the output of following function if we call this function by passing int 5? template T reciprocal(T x) {return (1/x); } 3
Answer:-
0 The output will zero as 1/5 and its .05 but conversion to int make it zero
Above is prototype of template class so assume passing an int and returning an int
Question 11:
Identify the errors in the following member operator function and also correct them
. math * operator(math m);
math * operator (math m)
{
math temp;
temp.number= number * number;.
return number;
Answer:-
The errors are in the arguments of the member operation function and also in the body of operator member function.
Correct function should be
math *operator(math *m);
math *operator (math *m)
{
math temp;
temp = m;
temp.number= number * number;
return temp.number;
Question No.1:
Define buffer? Explain its usage? 5 MARKS
Answer:
a program that writes the output data to the disc, it will be nice to collect the output data (numbers) and write it on the disc in one write operation instead of writing the numbers one by one. The area where we gather the numbers is known as buffer.
CS201 final exam past papers -vuknowledgeonline
Question No.2:
Why binary search algorithm is efficient than linear search algorithm? 5 marks
Answer: (page118)
Binary search algorithm is more efficient than liner algorithm because the arrays are sorted in ascending or descending order and we use “divide and conquer” technique. In binary search each iteration reduces the search by the factor of two but in the linear we have the same number of searches as we have the number of elements. E.g. if we have array of 1000 elements the linear search will take 1000 iterations however binary search will take max 10.
Question No.3:
Operator function ka syntax (3 marks) 4
Question No.4:
Post increment and pre increment k syntax btana thay(2 marks)
Answer:
Classname operator ++(); ---- pre increment
Classname operator ++(int) ---- post increment
Question No.5:
What is language translator?(2 marks)
Answer: Page 12
So we need a translator which translates the code of our program into machine language. There are two kinds of translators which are known as Interpreter and Compilers. These translators translate our program which is written in C-Language into Machine language
Question No.6:
Write something something about testing in designing program? 3 MARKS
Answer:-
Testing. The programmer should design a test plan and use it to test the program. It is a good idea, when possible, to have someone else test the program.
Question No.7:
Read the given below code and explain what task is being performed by this function 5 MARKS
Matrix :: Matrix ( int row , int col )
{
numRows = row ;
numCols = col ;
elements = new ( double * ) [ numRows ] ;
for ( int i = 0 ; i < numRows ; i ++ )
{
elements [ i ] = new double [ numCols ] ;
for ( int j = 0 ; j < numCols ; j ++ )
elements [ i ] [ j ] = 0.0 ;
}
}
Hint : This function belong to a matrix class, having
Number of Rows = numRows
Number of Columns = numCols
Which one (copy constructor or assignment operator) will be
called in each of the following code segment?
1) Matrix m1 (m2);
2) Matrix m1, m2; m1 = m2;
3) Matrix m1 = m2;
Answer:-
In this code the matrix function is defined, it get the number of rows from the user and create the row of 5 matrix and then get the columns from the user and create the columns. The New is showing for creating more array space for the data which user enters. The elements [i][j] will print the data in matrix
Question No: 27 ( Marks: 2 )
How many arguments a Unary Operator take? Can we make a binary operator as unary operator?
Answer:-
Unary operator takes only one arguments like i++ or i-- (Post increment or post decrement operators for integers) or ++i,--i (Pre increment or pre decrement operators for integers) ,we can not make Unary operator as binary or binary as Unary operator.
Question No: 28 ( Marks: 2 )
Which arithmetic operators cannot have a floating point operand?
Answer:-
Modulus operator
This operator can only be used with integer operands ONLY
CS201 final exam past papers -vuknowledgeonline
Question No: 29 ( Marks: 2 )
What are manipulators? Give one example.
Answer:-
The manipulators are like something that can be inserted into stream, effecting a change in the behavior. For example, if we have a floating point number, say pi (л), and have written it as float pi = 3.1415926 ; Now there is need of printing the value of pi up to two decimal places i.e. 3.14 . This is a formatting functionality. For this, we have a manipulator that tells about width and number of decimal points of a number being printed.
OR
Answer:
Manipulators are operators used in C++ for formatting output. The data is manipulated by the programmer’s choice of displayed. Endl manipulator: This manipulator has the same functionality as the „\n newline character.
Question No: 30 ( Marks: 2 )
Write down piece of code that will declare a matrix of 3x3. And initialize all its locations with 0;
Answer:-
int matrix [3] [3] ;
matrix [0] [0] = 0;
matrix [0] [1] = 0;
matrix [0] [2] = 0;
matrix [1] [0] = 0;
matrix [1] [2] = 0;
matrix [1] [2] = 0;
matrix [2] [0] = 0;
matrix [2] [1] = 0;
matrix [2] [2] = 0;
Another answer:-
we can also do it as given below
int matrix [3][3] = { 0 }; //all elements 0
Question No: 31 ( Marks: 3 )
Which one (copy constructor or assignment operator) will be called in each of the following code segment?
1) Matrix m1 (m2);
2) Matrix m1, m2; m1 = m2;
3) Matrix m1 = m2;
Answer:-
1) Matrix m1 (m2); copy constructor
2) Matrix m1, m2; m1 = m2; assignment operator
3) Matrix m1 = m2; assignment operator
Question No: 32 ( Marks: 3 )
What will be the output of following function if we call this function by passing int 5?
template <class T >
{
CS201 final exam past papers -vuknowledgeonline
Many thing can be possible without using templates but it do offer several clear advantages not offered by any other techniques:
Advanatages:
• Templates are easier to write than writing several versions of your similar code for different types. You 8 create only one generic version of your class or function instead of manually creating specializations.
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• Templates are type-safe. This is because the types that templates act upon are known at compile time, so the compiler can perform type checking before errors occur.
• Templates can be easier to understand, since they can provide a straightforward way of abstracting type information.
• It help in utilizing compiler optimizations to the extreme. Then of course there is room for misuse of the templates. On one hand they provide an excellent mechanism to create specific type-safe classes from a generic definition with little overhead
. Disadvantages:
On the other hand, if misused
• Templates can make code difficult to read and follow depending upon coding style.
• They can present seriously confusing syntactical problems esp. when the code is large and spread over several header and source files.
• Then, there are times, when templates can "excellently" produce nearly meaningless compiler errors thus requiring extra care to enforce syntactical and other design constraints. A common mistake is the angle bracket problem.
Question No: 36 ( Marks: 5 )
Suppose a program has a math class having only one data member number. Write the declaration and definition of operator function to overload + operator for the statements of main function.
math obj1, obj2;
obj2= 10 + obj1 ;
Answer:-
#include<iostream>
CS201 final exam past papers -vuknowledgeonline
x++;
cout << x << endl ;
}
Answer:
1 2 3
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Question No: 32 ( Marks: 3 )
What is the keyword ‘this’ and what are the uses of ‘this’ pointer?
Answer:
'this' is use to refer the current class member without using the name of the class.We cannot use it as a variable name. ‘this’ pointer is present in the function, referring to the calling object. this pointer points to the current object
. Question No: 33 ( Marks: 3 )
Suppose an object of class A is declared as data member of class B.
(i) The constructor of which class will be called first?
Answer: A
(ii) The destructor of which class will be called first?
Answer: B
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Question No: 34 ( Marks: 5 )
Write the general syntax of a class that has one function as a friend of a class along with definition of friend function.
Answer:
class frinedclass{
public:
friend int compute(exforsys e1)
};
Int compute(exforsys e1)
{
//Friend Function Definition which has access to private data
return int(e1.a+e2.b)-5;
}
CS201 final exam past papers -vuknowledgeonline
Question No: 35 ( Marks: 5 )
Write down the disadvantages of the templates.
Answer: Repeated
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