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XII CBSE Previous Year Question Paper. QUESTION NO 1 (D) 2 or 3 Marks. 1. (d) Find the output of the following program : Delhi 2006 3 #include<iostream.h> #include<string.h> class state { char *state_name; int size; public:

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xii cbse previous year question paper
XII CBSE Previous Year Question Paper

QUESTION NO

1 (D)

2 or 3 Marks

slide2

1. (d) Find the output of the following program :

Delhi 2006 3

#include<iostream.h>

#include<string.h>

class state

{ char *state_name;

int size;

public:

state( ); { size=0; state_name=new char[size+1]; }

state(char *s)

Contd…

slide3

{ size = strlen(s) ; state_name = new char[size+1];

strcpy(state_name,s);

}

void display( ) {cout<<state_name<<endl;}

void Replace (state & a, state & b)

{ size = a.size + b.size;

delete state_name;

state_name = new char[size+l];

strcpy(state_name, a.state_name);

strcat(state_name, b.state_name);

}

}; contd…

slide4

void main( )

{ char * temp = “Delhi”;

state state1 (temp), state2(“Mumbai”), state3(“Nagpur”), S1, S2;

S1.Replace(state1, state2);

S2. Replace(S1, state3);

S1.display( );

S2.display( );

}

slide5

Answer:

(d) DelhiMumbai

DelhiMumbaiNagpur

(3 full marks for identifying error in definition of the constructor

state() in Line 7)

OR

(3 marks for the correct lines of output)

OR

(2 marks for any one correct line of output)

OR

(1 Mark for showing the output starting with Delhi)

slide6

2 (d) Find the output of the following program : OD 2006 3

#include<iostream.h>

#include<string.h>

class student

{ char *name;

int l;

public:

student() { l=0; name=new char[1+1]; }

student(char *s)

{ l=strlen(s); name=new char[1+1];

strcpy (name,s);

} contd…

slide7

void display() { cout<<name<<endl;}

void manipulate(student & a, student & b)

{ l=a.l + b.l;

delete name;

name=new char[l+l];

strcpy(name, a.name);

strcat(name, b.name);

}

};

slide8

void main()

{ char * temp =\'\'Jack\'\';

student name1(temp), name2(\'\' Jill\'\'), name3(\'\' John\'\' ),S1,S2;

S1.manipulate(name1,name2);

S2.manipulate(S1,name3);

S1.display();

S2.display();

}

slide9

Answer :

(d) JackJill

JackJillJohn

(2 marks for any one correct line)

(Full 3 marks for both lines correct)

(½ mark to be deducted from full 3 marks, if endl is not considered)

slide10

3 (d) Find the output of the following program : Delhi 2007 2

#include<iostream.h>

void main()

{

int Numbers[] = {2,4,8,10};

int *ptr = Numbers;

for (int C = 0; C<3; C++)

{

cout<< *ptr << “@”;

ptr++;

}

slide11

3 (d) Find the output of the following program : Delhi 2007 2

cout<<endl;

for(C = 0; C<4; C++)

{

(*ptr)*=2;

--ptr;

}

for(C = 0; C<4; C++)

cout<< Numbers [C]<< “#”;

cout<<endl;

}

slide12

(d) 2 @ 4 @ 8 @

4 # 8 # 16 # 20 #

(1 Mark for each correct line of output)

Note:

· ½ Mark to be deducted for missing symbols in each line of output

· ½ Mark to be deducted if endl is not considered in the output

· As Borland C++ Compiler declares for loop variable locally,the program will result in syntax errors. So, any studentspecifying Variable C not declared OR mentioning that the program will not RUN

slide13

4 (d) Find the output of the following program : OD 2007 2

# include < iostream.h>

void main ()

{

intArray[] = {4,6,10,12};

int *pointer = Array ;

for (int I=1 ; I<=3 ; I++)

{

cout<<*pointer<<#”;

pointer ++;

}

slide14

4 (d) Find the output of the following program : OD 2007 2

cout<<endl;

for (I=1 ; I<=4 ; I++)

{

(*pointer)*=3 ;

-- pointer;

}

for(I=l; I<5; I + + )

cout << Array [I-1] << “@”;

cout << endl;

}

slide15

(d) 4 # 6 # 10 #

12 @ 18 @ 30 @ 36 @

(1 Mark for each correct line of output)

Note:

· ½ Mark to be deducted for missing symbols in the output

· ½ Mark to be deducted if endl is not considered in the output

· As Borland C++ Compiler declares for loop variable locally,the program will result in syntax errors. So, any student specifying Variable I not declared OR mentioning that the program will not RUN due to incorrect syntax should be awarded full 2 Marks

slide16

5 (d) Find the output of the following program: Delhi 2008 3

#include<iostream.h>

#include<ctype.h>

void main ( )

{

char Text [ ] = “[email protected]!”;

for (int I = 0; Text (I)! = ‘\0’; 1++)

{

if (!isalpha (Text[I]))

Text [I] = ‘*’;

else if (isupper (Text[I]))

Text [I] = Text [I] + 1 ;

slide17

5 (d) Find the output of the following program: Delhi 2008 3

Text [I] = Text [I] + 1 ;

else

Text (I) = Text [I+ 1];

}

cout<<Text;

}

slide18

Ans:

[email protected]*Xrk!*

(½ Mark for N in the 1st position)

(½ Mark for nd in the 2nd and 3rd position)

(½ Mark for @ in the 4th position)

(½ Mark for * in the 5th position)

(½ Mark for Xrk!)

(½ Mark for * at the end)

332

OR

(Fu1l 3 Marks If error is mentioned in the code for Text (I) after last else)

slide19

6. (d) Find the output of the following program : OD 2008 3

#include<iostream.h>

#include<ctype.h>

void main ( )

{

char Mystring[ ] =“[email protected]!” ;

for(int I = 0; Mystring [I] ! =’ \0\'; I++)

{

if (!isalpha (Mystring[I]))

Mystring [I] = ‘*’;

else if (isupper (Mystring[I]))

slide20

6. (d) Find the output of the following program : OD 2008 3

Mystring [I] = Mystring[I] +1;

else

Mystring [I] = Mystring [I+1];

}

cout<<Mystring;

}

slide21

Ans:

[email protected]*PVUQVU*

(½ Mark for X in the first position)

(½ Mark for at in the 2nd & 3rd positions)

(½ Mark for @ in the 4th position)

(½ Mark for * in the 5th position)

(½ Mark for PVUQvu)

(½ Mark for * at the end)

slide22

7 (d) Find the output of the following program : Delhi 2009 3

#include<iostream.h>

void main ( )

{

int X[ ] = {10, 25, 30, 55, 100};

int *p = X ;

while ( *p < 110)

{

if (*p%3 ! = 0)

*p = *p + 1 ;

else

*p = *p + 2 ;

slide23

7 (d) Find the output of the following program : Delhi 2009 3

p++;

}

for(int I = 4 ; 1>= 1 ; I - -)

{

cout << X[I] << “*” ;

if ( I%3 = = 0) cout<<endl ;

}

cout<<X[0]*3<<endl ;

}

slide24

Ans

          • 1110*56*
          • 32*26*33
  • (½ Mark for each correct value)
  • (½ Mark for all correct endl and *)
slide25

8 (d) Find the output of the following program: OD 2009 3

#include<iostream.h>

void main ( )

{

int A[ ] = {10, 15, 20, 25, 30}

int *p = A;

while (*p < 30)

{

if (*p%3 ! = 0)

*p = *p + 2 ;

else

*p = *p + 1;

slide26

8 (d) Find the output of the following program: OD 2009 3

p++;

}

for (int J = 0; J<=4; J++)

{

cout << A[J] << “*” ;

if ( J%3 = = 0) cout<<end1;

slide27

Ans

12*

16*22*27*

30*90

(1 Mark for each line with correct values)

Note:

Deduct ½ Mark if any/all ‘*’ missing

Deduct ½ Mark if endl is not considered at the right positions

slide28

9 (d) Find the output of the following program : Delhi 2010 3

#inc1ude <iostream.h>

struct POINT

{int X, Y, Z;};

void StepIn(POINT & P, int Step=1)

{

P.X+=Step;

P.Y -=Step;

P.Z+=Step;

}

slide29

9 (d) Find the output of the following program : Delhi 2010 3

void StepOut(POINT & P, int Step=1)

{

P.X-=Step;

P.Y+=Step;

P.Z–=Step;

}

slide30

9 (d) Find the output of the following program : Delhi 2010 3

void main ( )

{

POINT P1={15, 25, 5}, P2={10, 30, 20};

StepIn(P1);

StepOut(P2,4);

cout<<P1.X<<“,”<<P1.Y<<“,”<<P1.Z<<endl;

cout<<P2.X<<“,”<<P2.Y<<“,”<<P2.Z<<endl;

StepIn(P2,12);

cout<<P2.X<<“,”<<P2.Y<<“,”<<P2.Z<<endl;

}

slide31

Ans.

          • 16, 24, 6
          • 6, 34, 16
          • 18, 22, 28
  • (1 Mark for each line with -correct values)
  • OR
  • (½ Mark for any two correct values in each line)
  • Note:
  • Deduct (½ Mark if any/all ‘,’ missing
  • Deduct (½ Mark if endl is not considered at the right positions
slide32

10 (d) Find the output of the following program: OD 2010 3

#include <iostream.h>

struct THREE_D

{int X,Y,Z;};

void MoveIn(THREE_D &T, int Step=l)

}

T.X+=Step;

T.Y-=Step;

T.Z+=Step

}

slide33

10 (d) Find the output of the following program: OD 2010 3

void MoveOut(THREE_D &T, int Step=l)

{

T.X-=Step;

T.Y+=Step;

T.Z-=Step;

}

slide34

10 (d) Find the output of the following program: OD 2010 3

void main ()

{

THREE_D Tl={lO,20,5},T2={30,lO,40};

MoveIn(T1);

MoveOut(T2,5);

cout<<Tl.X<<“,”<<Tl.Y<<“,”<<T1.Z<<endl;

cout<<T2.X<<“,”<<T2.Y<<“,”<<T2.Z<<endl;

MoveIn(T2,l0);

cout<<T2.X<<“,”<<T2.y<<“,”<<T2.Z<<endl;

}

slide35

Ans.

          • 11, 19, 6
          • 25, 15, 35
          • 35, 5, 45
  • (1 Mark for each line with correct values)
  • OR
  • (½ Mark for any two correct values in each line)
  • Note:
  • Deduct ½ Mark if any/all \',\' missing
  • Deduct ½ Mark if endl is not considered at the right positions
slide36

11 (d) Find the output of the following program: Delhi 2011 3

#inc1ude<iostream.h>

void ChangeArray(int Number, int ARR[ ], int Size)

{

for (int L =0; L<Size; L++)

if (L<Number)

ARR [L] +=L;

e1se

ARR [L] *=L;

}

slide37

11 (d) Find the output of the following program: Delhi 2011 3

void Show (int ARR [ ], int Size)

{

for (int L=0; L<Size; L++)

(L%2!=0) ?cout<<ARR[L] <<"#": cout<<ARR[L]<<end1 ;

}

void main ( )

{

int Array [ ] = {30, 20, 40, 10, 60, 50};

ChangeArray (3, Array, 6) ;

Show (Array, 6) ;

}

slide38

Ans

            • 30
            • 21#42
            • 30#240
            • 250#
  • (½ Mark for each correct value)
  • Note:
  • Deduct ½ Mark for not writing # at proper places
  • Deduct ½ Mark for not considering endl at proper places
slide39

12 (d) Find the output of the following program: OD 2011 3

#include <iostream.h>

void SwitchOver(int A [ ], int N, int Split)

{

for (int K=0 ; K<N; K++)

if (K<Split)

A(K]+ =K;

else

A [K]*=K;

}

slide40

12 (d) Find the output of the following program: OD 2011 3

void Display (int A [ ], int N)

{

for (int K=0 ; K<N ; K++)

(K%2==0)? cout<<A[K]<<"%":cout<<A(K]<<end1;

}

void main ( )

{

int H[ ]= {30,40,50,20,10,5};

SwitchOver (H, 6, 3);

Display (H, 6);

}

slide41

Ans

            • 30%41
            • 52%60
            • 40%25
  • (1 Mark for each line with correct values)
  • Note:
  • Deduct ½ Mark if any/all \'% t missing
  • Deduct ½ Mark if endl is not considered at the right positions
slide42

13 (d) Find the output of the following program: SP 2010 SET I 3

#include <iostream.h>

struct GAME

{ int Score, Bonus;};

void Play(GAME &g, int N=10)

{

g.Score++;g.Bonus+=N;

}

slide43

13 (d) Find the output of the following program: SAMPLE PAPER 2010 SET I 3

void main()

{

GAME G={110,50};

Play(G,10);

cout<<G.Score<<":"<<G.Bonus<<endl;

Play(G);

cout<<G.Score<<":"<<G.Bonus<<endl;

Play(G,15);

cout<<G.Score<<":"<<G.Bonus<<endl;

}

slide44

Ans: (d) 3

          • 111:60
          • 112:70
          • 113:85
  • (1 Mark for each correct line of output)
slide45

14 (d) Find the output of the following program: SAMPLE PAPER 2010 SET II 3

#include <iostream.h>

void Changethecontent(int Arr[ ], int Count)

{

for (int C=1;C<Count;C++)

Arr[C-1]+=Arr[C];

}

void main()

{

int A[]={3,4,5},B[]={10,20,30,40},C[]={900,1200};

Changethecontent(A,3);

slide46

14 (d) Find the output of the following program: SAMPLE PAPER 2010 SET II 3

Changethecontent(B,4);

Changethecontent(C,2);

for (int L=0;L<3;L++) cout<<A[L]<<\'#\';

cout<<endl;

for (L=0;L<4;L++) cout<<B[L] <<\'#\';

cout<<endl;

for (L=0;L<2;L++) cout<<C[L] <<\'#\';

}

slide47

d)

          • 7#9#5#
          • 30#50#70#40#
          • 2100#1200#
  • (1 Mark for each line of output)
slide52

17 (d) Find the output of the following program:

SAMPLE PAPER 2009 SET I 3

#include <iostream.h>

struct PLAY

{ int Score, Bonus;};

void Calculate(PLAY &P, int N=10)

{

P.Score++;P.Bonus+=N;

}

void main()

{

PLAY PL={10,15};

Calculate(PL,5);

slide53

17 (d) Find the output of the following program:

SAMPLE PAPER 2009 SET I 3

cout<<PL.Score<<”:”<<PL.Bonus<<endl;

Calculate(PL);

cout<<PL.Score<<”:”<<PL.Bonus<<endl;

Calculate(PL,15);

cout<<PL.Score<<”:”<<PL.Bonus<<endl;

}

slide54

17 SAMPLE PAPER 2009 SET I

  • Answer:
            • 11:20
            • 12:30
            • 13:45
  • (1 Mark for each correct line of output)
  • Note:
  • Deduct ½ Mark for not showing : in the output
  • Deduct ½ Mark for not considering endl
slide55

18 (d) Find the output of the following program: SAMPLE PAPER 2009 SET II 3

#include <iostream.h>

void Changethecontent(int Arr[], int Count)

{

for (int C=1;C<Count;C++)

Arr[C-1]+=Arr[C];

}

slide56

18 (d) Find the output of the following program: SAMPLE PAPER 2009 3

void main()

{

int A[]={3,4,5},B[]={10,20,30,40},C[]={900,1200};

Changethecontent(A,3);

Changethecontent(B,4);

Changethecontent(C,2);

for (int L=0;L<3;L++)

slide57

18 (d) Find the output of the following program: SAMPLE PAPER 2009 SET II 3

cout<<A[L]<<’#’;

cout<<endl;

for (L=0;L<4;L++) cout<<B[L] <<’#’;

cout<<endl;

for (L=0;L<2;L++) cout<<C[L] <<’#’;

}

slide58

18 SAMPLE PAPER 2009 SET II

  • Answer:
            • 7#9#5#
            • 30#50#70#40#
            • 2100#1200#
  • (1 Mark for each correct line of output)
  • Note:
  • Deduct ½ Mark for not showing : in the output
  • Deduct ½ Mark for not considering endl
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