CBSE Class 12 Computer Science Sample Paper 2014 Set B

1. (a) What is the difference between Global Variable and Local Variable? Also, give a suitable C++ code to illustrate both. 

(b) Which C++ header file(s) will be essentially required to be included to run execute the following C++ code: 

void main()

{

char Msg[ ]="Sunset Gardens";

for (int I=5;I<strlen(Msg);I++)

puts(Msg);

}

(c) Rewrite the following program after removing the syntactical errors (if any).

Underline each correction. 

#include [iostream.h]

class MEMBER

{

int Mno;float Fees;

PUBLIC:

void Register(){cin>>Mno>>Fees;}

void Display{cout<<Mno<<" : "<<Fees<<endl;}

};

void main()

{

MEMBER M;

Register();

M.Display();

}

(d) Find the output of the following program: 

#include <iostream.h>

struct GAME

{ int Score, Bonus;};

void Play(GAME &g, int N=10)

{

g.Score++;g.Bonus+=N;

}

void main()

{

GAME G={110,50};

Play(G,10);

cout<<G.Score<<":"<<G.Bonus<<endl;

Play(G);

cout<<G.Score<<":"<<G.Bonus<<endl;

Play(G,15);

cout<<G.Score<<":"<<G.Bonus<<endl;

}

(e) Find the output of the following program: 

#include <iostream.h>

void Secret(char Str[ ])

{

for (int L=0;Str[L]!='\0';L++);

for (int C=0;C<L/2;C++)

if (Str[C]=='A' || Str[C]=='E')

Str[C]='#';

else

{

char Temp=Str[C];

Str[C]=Str[L-C-1];

Str[L-C-1]=Temp;

}

}

void main()

{

char Message[ ]="ArabSagar";

Secret(Message);

cout<<Message<<endl;

}

(f) In the following program, if the value of Guess entered by the user is 65, what will be the expected output(s) from the following options (i), (ii), (iii) and (iv)? 

#include <iostream.h>

#include <stdlib.h>

void main()

{

int Guess;

randomize();

cin>>Guess;

for (int I=1;I<=4;I++)

{

New=Guess+random(I);

cout<<(char)New;

}

}

(i) ABBC

(ii) ACBA

(iii) BCDA

(iv) CABD

2. (a) What do you understand by Data Encapsulation and Data Hiding? Also, give a suitable C++ code to illustrate both. 

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

class Seminar

{

int Time;

public:

Seminar() //Function 1

{

Time=30;cout<<"Seminar starts now"<<end1;

}

void Lecture() //Function 2

{

cout<<"Lectures in the seminar on"<<end1;

}

Seminar(int Duration) //Function 3

{

Time=Duration;cout<<"Seminar starts now"<<end1;

}

~Seminar()

//Function 4

{

cout<<"Vote of thanks"<<end1;

}

};

i) In Object Oriented Programming, what is Function 4 referred as and when does it get invoked/called?

ii) In Object Oriented Programming, which concept is illustrated by Function 1 and Function 3 together? Write an example illustrating the calls for these functions.

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