CBSE Class 12 Computer Science Sample Paper 2018 Solved Set B

1. (a) Out of the following, find those identifiers, which cannot be used for naming Variable, Constants or Functions in a C++ program : 

_Cost, Price*Qty, float, Switch, Address One, Delete, Number12, do

(b) Jayapriya has started learning C++ and has typed the following program. When she compiled the following code written by her, she discovered that she needs to include some header files to successfully compile and execute it. Write the names of those header files, which are required to be included in the code. 1

void main()

{ float A, Number, Outcome;

cin>>A>>Number;

Outcome=pow(A,Number);

cout<<Outcome<<endl; }

(c) Rewrite the following C++ code after removing any/all syntactical errors with each correction underlined. 

Note : Assume all required header files are already being included in the program.

#define Equation(p,q)=p+2*q

void main()

{

float A=3.2;B=4.1;

C=Equation(A,B);

cout<<’Output=’<<C<<endl;

}

(d) Find and write the output of the following C++ program code : 

Note : Assume all required header files are already included in the program.

typedef char STRING[80];

void MIXITNOW(STRING S)

{ int Size=strlen(S); for(int I=0;I<Size–1;I+=2)

{ char WS=S[I]; S[I]=S[I+1];

S[I+1]=WS; }

for(I=1;I<Size;I+=2) if(S[I]>=’M’ && S[I]<=’U’)

S[I]=’@’; }

void main()

{ STRING Word=”CRACKAJACK”; MIXITNOW(Word); cout<<Word<<endl; }

(e) Find and write the output of the following C++ program code : 

Note : Assume all required header files are already being included in the program.

class Stock

{

long int ID; float Rate; int Date;

public:

Stock(){ID=1001;Rate=200;Date=1;}

void RegCode(long int I,float R) 

{

ID=I;

Rate=R;

}

void Change(int New,int DT)

{

Rate+=New;

Date=DT; }

void Show()

{

cout<<”Date :”<<Date<<endl;

cout<<ID<<”#”<<Rate<<endl;

} };

void main()

{

Stock A,B,C;

A.RegCode(1024,150);

B.RegCode(2015,300);

B.Change(100,29);

C.Change(–20,20);

A.Show();

B.Show();

C.Show();

}

(f) Look at the following C++ code and find the possible output(s) from the options (i) to (iv) following it. Also, write the maximum and the minimum values that can be assigned to the variable CHANGER. 

Note : Assume all the required header files are already being included in the code.

• The function random(n) generates an integer between 0 and n – 1

• void main()

{

randomize();

int CHANGER;

CHANGER=random(3);

char CITY[][25]={“DELHI”,”MUMBAI”,”KOLKATA”,”CHENNAI”};

for(int I=0;I<=CHANGER;I++)

{

for(int J=0;J<=I;J++) cout<<CITY[J]; cout<<endl; } }

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