CBSE Class 12 Computer Science Question Paper 2020 Set A

CBSE Class 12 Computer Science Question Paper 2020 Set A. Students can download the last year board exams question papers using the link below. Free download of examination question papers with solutions. Last 10 year question papers should be practised to get better marks in examinations.

1. a) What is difference between type casting and automatic type conversion? Explain with suitable example in C++.

b) Name the header files for which the following function belongs:

(i) setw ( ) (ii) isalnum( )

c) Rewrite the following program after removing all syntactical error(s), if any. Underline each correction:


struct Display


int ROW, COL;


void Showpoint(Display D)


cout<< D.ROW << D.COL <<endl;


void main( )


Display Disp1 = ( 10, 20 );

Display Disp2 = Disp1;

Disp1.Showpoint( );

ROW + = 15;

Showpoint( ).Disp2;


d) Give the output of the following program:


void main( )


int *ptrArray[10];

int marks[ ] = {75, 68, 90, 34, 0, 10, 90, 65};

for ( int i = 0 ; marks[i] != 0 ; i++)


ptrArray[i] = &marks[i];

*(ptrArray[i]) += 5;


int index = 0;

while(index < i)


int k = *(ptrArray[index]);

if (k > 60)

cout<< k <<” , ”;




e) Give the output of the following program:




void main( )


char*DATA = " a HexaDecimal" ;

for(int ctr = 0 ; ctr<strlen(DATA) ; ctr ++)

if(islower (DATA[ctr] ))

DATA[ctr] = toupper(DATA[ctr]);



if((ctr%2) ! = 0)

DATA[ctr] = tolower(DATA[ctr - 1]);


DATA[ctr]=DATA[ctr] -2;




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