CBSE Class 12 Computer Science Sample Paper 2017 Solved Set E

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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