CBSE Class 12 Computer Science Sample Paper 2017 Set 05 Solved

1. (a) What is the difference between Type casting and Automatic type Conversion? Give examples 

(b)Write the names of the header files which are necessary to execute the following C++ code 

void main()

{ char name[40];

strcpy(name, “Vijay Sharma”);

puts(name)

}

(c) Identify and correct the errors if any, underline the correction 

#include<iostream h>

int main

{

Unsigned long i,fact=1;

cout<<”Enter a number “;

cin>>num;

while(num)

{

fact=fact*fact;

--num;

}

cout<<”the factorial is “<<fact;

}

(d) Find the output of the following program (imagine header files are included) 

void main()

{

clrscr();

char *NAME = "@KVid5yaLaY*a";

for (int x = 0; x < strlen(NAME); x++)

if (islower(NAME[x]))

NAME[x] = toupper(NAME[x]);

else

if (isupper(NAME[x]))

if (x%2==0)

NAME[x] = tolower(NAME[x]);

else

NAME[x] = NAME[x-1];

puts(NAME);

getch();

}

(e) Give the output of the following program 3

#include<iostream.h>

#include<conio.h>

void Execute(int &B, int C = 50)

{

int TEMP = B+C;

B += TEMP;

if(C != 150)

cout << " "<<TEMP<<" " <<" "<< B <<" "<< C << endl;

}

void main ( )

{

clrscr();

int M = 20, N = 10;

Execute(M);

cout <<" "<< M<< " "<<" "<< N << endl;

Execute(M, N);

cout <<" "<<M <<" "<< N << endl;

getch();

}

(f) Find the possible out put(s) & What will be the minimum & Maximum values 2

#include<stdlib.h>

#include<iostream.h>

#include<conio.h>

void main()

{

clrscr();

randomize();

int N, numgus;

N=10;

numgus=random(N)+10; 

cout<<numgus<<endl;

getch();

}

2. (a)What do you mean by a temporary instance of a class ? What is its use? how is it created? 

(b)Answer the questions(i) and(ii) after going through the following class: 

class TestMeOut

{public:

~TestMeOut() //Function 1

{ cout<<"Play over"<<endl; }

TestMeOut( ) //Function 2

{cout<<"Preparing to play"<<endl;

void MyWork( )

{ cout<<"Playing"<<endl

}

(i) In OOP what is Function 1 referred as and when does it get invoked?

(ii) In OOP what is Function 2 referred as and when does it get invoked? Write the statement to invoke Function2.

(c) Define a class serverspace with the following specifications. 

Private members of the class

Filenames – an array of strings of size[10][25]

( to represent all the names of files inside serverspace )

Availspace – long

( to represent total number of bytes available in serverspace)

Usedspace – long

( to represent total number of bytes used in serverspace)

public members of the class

(d)Answer the questions i to iv based on the following code 4

Newfileentry() – Afunction to accept values of Filenames, Availspace and Usedspace from user

Retavailspace() – A Fucntion that returns the value of total Kilobytes

available ( 1 Kilobytes = 1024 bytes)

Showfiles() – a function that displays the names of all the files in serverspace

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