CBSE Class 12 Computer Science Sample Paper 2020 Solved (1)

CBSE Class 12 Computer Science Sample Paper 2020 Solved (1). It’s always recommended to practice as many sample papers as possible before the examinations. Students can download the sample papers and also question papers of previous years to practice and score better marks in examinations. Refer to other links too for more sample papers.

Section A (C++)

Q1. a. Differentiate between ordinary function and member functions in C++. Explain with an example. 

b. Write the related library function name based upon the given information in C++.

(i) Get single character using keyboard. This function is available in stdio.h file.

(ii) To check whether given character is alpha numeric character or not. This function is available in ctype.h file. 

c. Rewrite the following C++ program after removing all the syntactical errors (if any), underlining each correction. : 

include<iostream.h>

#define PI=3.14

void main( )

{ float r;a;

cout<<’enter any radius’;

cin>>r;

a=PI*pow(r,2);

cout<<”Area=”<<a

}

d. Write the output from the following C++ program code: 

#include<iostream.h>

#include<ctype.h> 

void strcon(char s[])

{

for(int i=0,l=0;s[i]!='\0';i++,l++);

for(int j=0; j<l; j++)

{

if (isupper(s[j]))

s[j]=tolower(s[j])+2;

else if ( islower(s[j]))

s[j]=toupper(s[j])-2;

else

s[j]='@';

}

}

void main()

{

char *c="Romeo Joliet";

strcon(c); cout<<"Text= "<<c<<endl;

c=c+3;

cout<<"New Text= "<<c<<endl;

c=c+5-2;

cout<<"last Text= "<<c

}

e. Find the output of the following C++ program: 

#include<iostream.h>

#include<conio.h>

#include<ctype.h>

class Class

{

int Cno,total;

char section;

public:

Class(int no=1)

{

Cno=no;

section='A';

total=30;

}

void addmission(int c=20)

{

section++;

total+=c;

}

void ClassShow()

{

cout<<Cno<<":"<<section<<":"<<total<<endl;

}

} ;

void main()

{

Class C1(5),C2;

C1.addmission(25);

C1.ClassShow();

C2.addmission();

C1.addmission(30);

C2.ClassShow();

C1.ClassShow();

}

f. Study the following C++ program and select the possible output(s) from it :

Find the maximum and minimum value of L. 

#include<stdlib.h>

#include<iostream.h>

#include<string.h>

void main()

{

randomize();

char P[]="C++PROGRAM";

long L;

for(int I=0;P[I]!='R';I++)

{

L=random (sizeof(L)) +5;

cout<<P[L]<<"-";

}

}

}

i) R-P-O-R-

ii) P-O-R-+-

iii) O-R-A-G-

iv) A-G-R-M-

Q2.a. How encapsulation and abstraction are implemented in C++ language? Explain with an example. 

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

class Stream

{

int StreamCode ; char Streamname[20];float fees;

public:

Stream( ) //Function 1

{

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