CBSE Class 12 Computer Science Sample Paper 2017 Set B

1. (a) What is difference between Type Casting and Automatic Type Conversion? Also, give a suitable C++ to illustrate both.

Ans. Explicit Type Casting is used to convert value of one type to another type for example

float x=(float) 3 / 2; // 1.5 will be assigned as result, because 3 is converted into 3.0 Automatic Type Conversion is the type conversion done by the compiler wherever required. e. g. float x=3/2; //here 1.0 will be assigned as result, because 1 is automatically converted in 1.0

1. (b) Write the names of the header files, which is/are essentially required to run/execute the following C++ code:

void main() 1

{char CH,Text[ ]=”+ve Attitude”;

for(int i=0;Text[ i]=’\0’’i++)

if(Text[i]==’ ‘)

cout<<endl;

else {CH=toupper(Text[i]);

cout<<CH;

}

}

Ans. Required header files are iostream.h and ctype.h

1. (c) Rewrite the following program after removing the syntactical errors (if any). Underline each correction.

include<iostream.h>

typedef char[80] String;

void main( )

{String S=”Peace”;

int L=strlen(S);

cout<<S<<’ has ‘<<L<<’characters’<<endl;

}

Ans.

#include<iostream.h>

#include<string.h>

typedef char [80] String;

void main( )

{

String S=”Peace”;

int L=strlen(S);

cout<<S<<” has “<<L<<” characters”<<endl;

}

1. (d) Find the output of the following program:

#include<iostream.h>

void SwitchOver(int A[ ], int N, int Split)

{ for (int K=0; K<N; K++)

if(K<Split)

A[K]+=K;

else

A[K]*=K;

}

void display(int A[ ], int N)

{ for(int K=0; K<N; K++)

(K%2==0) ? cout<<A[K]<<”%” : cout<<A[K]<<endl;

}

void main( )

{ int H[30, 40, 50, 20, 10, 5};

SwitchOver(H,6,3);

Display(H, 6);

}

Ans.cout<<endl;

}

}

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