CBSE Class 12 Computer Science Sample Paper 2017 Solved Set A

1. (a) Find the correct identifiers out of the following, which can be used for naming variable, constants or functions in a C++ program.

For, while, INT, NeW, delete, 1stName, Add+Subtract, name1

(b) Write the names of the header files which are essentially required to run the following C++ code [1]

void main( )

{

char String[ ] = “ Anna Hazare” ;

cout<<setw(12) <<String <<” and “<<toupper(String[0]);

}

(c) Rewrite the following program after removing the syntactical errors (if any). Underline each correction [2]

#include [iostream.h]

class PAYITNOW

{

int Charge;

PUBLIC:

void Raise()

{

cin>>Charge;

}

void Show

{

cout<<Charge;

}

};

void main()

{

PAYITNOW P;

P.Raise();

Show();

}

(d) Find the output of the following program: 

class Student

{ char grade;

int GP;

public: Student()

{

grade = ‘E’;

GP = 0;

}

void downgrade(int L)

{

grade - = L;

}

void upgrade(int L)

{ grade + = L;

GP + + ;

}

void show()

{

cout<<grade<<”@”<<GP<<endl;

}

};

void main()

{

Student s;

s.downgrade(4);

s.show();

s.upgrade(8);

s.show();

s.downgrade(5);

s.show();

}

(e) In the following program, what will be the output? Justify. [2]

#include <stdlib.h>

#include <iostream.h>

void main()

{

randomize();

int score [ ] = {25, 20, 34, 56, 72, 63}, myscore;

myscore = score[2 + random(2)];

cout << myscore <<endl;

}

i) 25 ii) 56 iii) 20 iv) None of these

(f) Find the output of the following program . [2]

void Location (int &X, int Y=4)

{

Y+= 2;

X+= Y;

}

void main()

{

int PX=10, PY=2;

Location (PY);

cout<<PX<<” ,”<<PY<<endl;

Location (PX, PY);

cout<<PX<<” ,”<<PY<<endl;

}

2. (a) What is function overloading? Write an example using C++ to illustrate the concept of function overloading. [2]

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

class Match

{

int Time;

public:

Match() //Function 1

{

Time=0;

cout<<”Match commences”<<end1;

}

void Details() //Function 2

{

cout<<”Inter Section Basketball Match”<<end1;

}

Match(int Duration) //Function 3

{

Time=Duration;

cout<<”Another Match begins now”<<end1;

}

Match(Match &M) //Function 4

{

Time=M.Duration;

cout<<”Like Previous Match ”<<end1;

}

};

i) Which category of constructor - Function 4 belongs to and what is the purpose of using it?

ii) Write statements that would call the member Functions 1 and 3

(c) Define a class TEST in C++ with following description: 

Private Members

• TestCode of type integer

• Description of type string

• NoCandidate of type integer

• CenterReqd (number of centers required) of type integer

• A member function CALCNTR() to calculate and return the number of centers as ((NoCandidates/100)+1)

Public Members

• A function SCHEDULE() to allow user to enter values for TestCode, Description, NoCandidate & call function CALCNTR() to calculate the number of Centres

• A function DISPTEST() to allow user to view the content of all the data members

(d) Given the following class definition, answer the questions that follow: 

class Medicines

{

char Category[10];

char mfg_date[10];

char Company;

public

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