CBSE Class 12 Computer Science Sample Paper 2014 Set 03

1. a) What are dynamic memory allocation operators in C++? Explain with example.

Ans. . In c++ dynamic memory allocation operators allocate/deallocate memory from the free store. They are : “new” operator : This operator can be used to allocate the memory dynamically. For ex. :- int *a = new int;

“delete” operator : When an object created by ‘new’ is no longer required, it must be destroyed so that the memory space occupied by it may be released for re-use. This can be done by ‘delete’ operator.

For ex. delete a ;

2. b) Which C++ header files will be essentially required to be included to execute the following code :

void main( )

{ int stuno=5;

char sname[ ]=”Kiara Joshi”;

cout<<setw(10)<<stuno<<endl;

puts(sname); }

Ans. <iomanip.h>, <stdio.h> & <iostream.h>

1 c) Rewrite the following program after removing all the syntactical errors underlining each correction. (if any) : #include<iostream.h>

class

{ int a;

static int b; //must be defined outside

public:

float c; //must not be initialized here

void INPUT( )

{ cin>>a>>c; }

void SHOW( )

{ cout<<b<<endl; }

static void PRN( )

{ cout<<b; } //can access only static data member

}; //must have a terminator 2

d) Give the output of the following program ( Assuming that all required header files are included in the program ) :

#include<iostream.h>

struct TD

{ int x,y,z; };

void MvIn(TD &P, int step=3)

{P.x+=step;

P.y-=step;

P.z+=step; }

void MvOut(TD &Q, int step=2)

{ Q.x-=step;

Q.y+=step;

Q.z-=step; }

void main()

{ TD ob1={15,25,5},ob2={40,20,10};

MvIn(ob1);

MvOut(ob2,5);

cout<<ob1.x<<','<<ob1.y<<','<<ob1.z<<endl;

cout<<ob2.x<<','<<ob2.y<<','<<ob2.z<<endl;

MvOut(ob2);

cout<<ob2.x<<','<<ob2.y<<','<<ob2.z<<endl; }

Output :

18,22,8

35,25,5

33,27,3 

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