CBSE Class 12 Computer Science Sample Paper 2017 Set 01 Solved

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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