Important Questions for Class 12 Computer Science (C++) – Pointers
Previous years Examination Questions
2 Marks Questions
Question 1:
Obtain the output from the following C++ program as expected to appear on the screen after its execution. Delhi 2014
Important Note:
All the desired header files are already included in the code, which are required to run the code.
void main()
{
char*String="SARGAM";
int *Ptr, A[]={l,5,7,9};
Ptr=A;
cout<<*Ptr<<String<<endl;
String++;
Ptr+=3;
cout<<*Ptr<<String<<endl;
}
Аnswer:
Output of the given program will be
1SARGAM
9ARGAM
Question 2:
Obtain the output from the following C+ + program as expected to appear on the screen after its execution. All India 2014.2013
Important Note:
All the desired header files are already included in the code, which are required to run the code.
void main()
{
char *Text = "AJANTA";
int *P,Num[] = {11,5,7,9};
P = Num;
cout<<*P<<Text<<endl;
Text++;
P++;
cout<<*P<<Text<<endl;
}
Аnswer:
Output of the given program will be
1AJANTA
5JANTA
Question 3:
Observe the following C+ + code carefully and obtain the output, which will appear on the screen after execution of it.
Delhi 2013
Important Note:
All the desired header files are already included in the code, which are required to run the code.
void main()
{
char *String = "SHAKTI";
int *Point, Value[]={10,15,70,19};
Point = Value;
cout<<*Point<<String<<endl;
String++;
Point++;
cout<<*Point<<String<<endl;
}
Аnswer:
Output of the given program will be
10SHAKTI
15HAKTI
Question 4:
Give the output of the following program segment: (Assuming, all desired header file(s) are already included). Delhi 2013C
void main()
{
float *Ptr,Points[] = {120,50,30,40,10};
Ptr=Points;
cout<<*Ptr<<endl;
Ptr+=2;
Points[2]+=2.5;
cout<<*Ptr<<endl:
Ptr++;
(*Ptr)+=2.5;
cout<<Points[3]<<endl;
}
Аnswer:
Output of the given program will be
20
32.5
42.5
Question 5:
Find the output of the following program: All India 2012
#include<iostream.h>
#include<conio.h>
#include<ctype.h>
typedef char Str80[80];
void main()
{
char *Notes;
Str80 Str="vR.zGooD";
int L=6;
Notes = Str;
while(L>=3)
{
Str[L]=isupper(Str[L])?
tolower(Str[L]);
toupper(Str[L]);
cout<<Notes<<endl;
L--;
Notes++;
getch();
}
}
Аnswer:
Output of the given program will be
vR.zGoOd
R.zGOOD
.zgOOD
ZgOOD
Question 6:
Find the output of the following program: Delhi 2012
#include<iostream.h>
#include<conio.h>
#include<ctype.h>
typedef char Txt80[80];
void main()
{
char *PText;
Txt80 Txt="Ur2GReAt";
int N=6;
PText=Txt:
while(N>=3)
{
Txt[N]=isupper(Txt[N])?
tolower(Txt[N]);
toupper(Txt[N]);
cout<<PText<<endl;
N--;
PText++;
}
}
Аnswer:
Output of the given program will be
Ur2GReat
r2GREat
2GrEat
grEat
Question 7:
In the following program, what will be the possible output(s) from the following options (i), (ii), (iii) and (iv)? Justify your answer. Delhi 2011C
#include<iostream.h>
#include<stdlib.h>
#include<string.h>
#include<conio.h>
void main()
{
clrscr();
char *Text="1234";
int L=strlen(Text);
randomize();
for(int I=0;I<L;I++)
{
int Start=random(I)+1;
char P=Text[Start];
cout<<P<<":";
}
getch();
}
(i) 1:3:2:4:
(ii) 2:2:3:2:
(iii) 2:2:4:4:
(iv) 2:2:2:3:
Аnswer:
The possible output will be (ii) 2:2:3:2: and (iv) 2:2:2:3:
Question 8:
Find the output of the following program : Delhi 2011
#include<iostream.h>
#include<conio.h>
void main()
{
int Track[] = {10, 25, 30, 55},*Striker;
Striker = Track;
Track[1] += 30;
cout<<"Striker"<<*Striker<<endl;
*Striker -= 10;
Striker++;
cout<<"[email protected]"<<*Striker<<endl;
Striker += 2;
cout<<"[email protected]"<<*Striker<<endl;
cout<<"Rest To"<<*Striker[0]<<endl;
}
Аnswer:
There is an error in last line, i.e. *Striker[0], so the program will not run. In case, if there is no subscript in Striker pointer, then the output would be
Striker10
[email protected]
[email protected]
Rest To55
Question 9:
Find the output of the following program: All India 2011
#include<iostream.h>
#include<conio.h>
void main()
{
int *Queen, Moves[]={11, 22, 33,44};
Queen = Moves;
Moves[2] += 22;
cout<<"Queen @"<<*Queen<<endl;
*Queen -= 11;
Queen += 2;
cout<<"[email protected]"<<*Queen<<endl;
Queen++;
cout<<"[email protected]"<<*Queen<<endl;
cout<<"New [email protected]"<<*Moves[0]<<endl;
}
Аnswer:
There is an error in last line, i.e. *Moves[0], so the program will not run. In case, if there is no subscript in Moves pointer, then the output would be
Queen @11
[email protected]
[email protected]
New [email protected]
Question 10:
Find the output of the following program:
#include<iostream.h>
#include<conio.h>
void main()
{
int Numbers[]={2,4,8,10};
int *ptr = Numbers;
for(int c=0;c<3;c++)
{
cout<<*ptr<<"@";
ptr++;
}
cout<<endl;
for(c=0:c<4:c++)
{
(*ptr) *= 2;
--ptr;
}
for(c=1:c<4;c++)
cout<<Numbers[c]<<"#";
cout<<endl;
}
Аnswer:
Output of the given program will be
[email protected]@[email protected]
8#16#20#
Question 11:
Find the output of the following program:
#include<iostream.h>
#include<conio.h>
void main()
{
int Array[]={4,6,10,12};
int *pointer = Array;
for(int i=1;i<=3;i++)
{
cout<<*pointer<<"#";
pointer++;
}
cout<<endl;
for(i=1;i<=4;i++)
{
(*pointer) *= 3;
--pointer;
}
for(i=l;i<5;i++)
cout<<Array[i-1]<<"@";
cout<<endl;
}
Аnswer:
Output of the given program will be
4#6#10#
[email protected]@[email protected]@
Question 12:
Give the output of the following program segment. (Assume, all required header files are included in the program.)
void main()
{
int a=32,*X=&a;
char ch=65, &eco=ch;
eco+=a;
*X+=ch;
cout<<a<<','<<ch<<endl;
}
Аnswer:
Output of the given program will be
129,a
Question 13:
Identify the syntax error(s), if any, in the following program. Also, give reason for errors.
void main()
{
const int i=20;
const int *const ptr=&i;
(*ptr)++;
int j=15;
ptr=&j;
}
Аnswer:
(*ptr)++ cannot modify a const object ptr-&j cannot modify a const object.
Question 14:
Give the output of the following program segment. (Assume, all required header files are included in the program.)
void main()
{
int array[] = {2,3,4,51};
int *arptr=array;
int value=*arptr;
cout<<va1ue<<'\n';
value=*arptr++;
cout<<value<<'\n';
value=*arptr;
cout<<value<<'\n';
value=*++arptr;
cout<<value<<'\n';
}
Аnswer:
Output of the given program will be
2
2
3
4
Question 15:
Give the output of the following program segment. (Assume, all required header files are included in the program.)
void main()
{
char *s="GOODLUCK";
for(int x=strlen(s)-1;x>=0;x--)
{
for(int y=0;y<=x;y++)
cout<<s[y];
cout<<endl;
}
}
Аnswer:
Output of the given program will be
GOODLUCK
G00DLUC
G00DLU
GOODL
GOOD
GOO
GO
G
Question 16:
Give the output of the following program segment. (Assume, all required header files are included in the program).
void main()
{
char *NAME="a ProFile";
for(int x=0;x<strlen(NAME);x++)
if(islower(NAME[x]));
else
if(isupper(NAME[x]))
if(x%2!=0)
NAME[x]=tolower(NAME[x-l]
else
NAME[x]--;
cout<<NAME<<endl;
}
Аnswer:
Output of the given program will be
a Orooile
Question 17:
Find and write the output of the following C++ program code: All India 2017
NOTE Assume all required header files are already being included in the program.
void main()
{
int *Point, Score[]={100,95,150,75,65,120};
Point=Score;
for(int L=0;L<6;L++)
{
if((*Point)%10==0)
*Point /= 2;
else
*Point -= 2;
if((*Point)%5==0)
*Point /= 5;
Point++;
}
for(int L=5;L>=0;L--)
cout<<Score[L]<<"*";
}
Аnswer:
Given program will give error, i.e. Multiple declaration for ‘L’
If we remove int from 2nd for loop then output will be:
12*63*73*15*93*10*
Question 18:
Find the output of the following program: Delhi 2012C
#include<iostream.h>
void main()
{
int Points=300;
int *Start=&Points;
int *End;
End=new int;
(*End)=Points-150:
Points+=100;
cout<<Points<<":"<<*Start<<endl;
cout<<*End<<endl;
Start=End;
cout<<Points<<":"<<*Start<<endl;
cout<<*End<<endl;
Points-=100;
*Start-=50;
cout<<Points<<":"<<*Start<<endl;
cout<<*End<<endl;
delete End;
}
Аnswer:
Output of the given program will be 400:400
150
400:150
150
300:100
100
Question 19:
Find the output of the following program Delhi 2009
#include<iostream.h>
#include<conio.h>
void main()
{
int X[]={10, 25, 30, 55, 110};
int *p=X;
whi1e(*p<110)
{
if(*p%3!= 0)
*p = *p+1;
else
*p = *p+2;
p++:
}
for(int 1=4;I>=1;I--)
{
cout<<X[I]<<"*";
if(I%3 == 0)
cout<<endl;
}
cout<<X[0]*3<<endl;
}
Аnswer:
Output of the given program will be
110*56*
32*26*33
Question 20:
Find the output of the following program. Delhi (C) 2009
#include<iostream.h>
#include<conio.h>
struct score
{
int Year;
float topper;
};
void Change(score *s, int x=20)
{
s->topper=(s->topper+25)-x;
s->Year++;
}
void main()
{
score Arr[]={{2007, 100},{2008, 951}};
score *Point=Arr;
Change(Point, 50);
cout<<Arr[0].Year<<"#"<<Arr[0].topper<<endl;
Change(++Point);
cout<<Point->Year<<"#"<<Point->topper<<endl;
}
Аnswer:
Output of the given program will be
2008#75
2009#100
Question 21:
Find the output of the following program. All India 2009
#include<iostream.h>
#include<conio.h>
void main()
{
int A[] = {10, 15, 20, 25. 30};
int *p = A;
whi1e(*p<30)
{
if(*p%3!= 0)
*p = *p+2;
else
*p = *p+1;
P++;
}
for(int J=0;J<=4;J++)
{
cout<<A[J]<<"*";
if(J*3 == 0)
cout<<endl;
}
cout<<A[4]*3<<endl;
}
Аnswer:
Output of the given program will be
12*
16*22*27*
30*90
Question 22:
What will be the output of the following program?
#include<iostream.h>
#include<ctype.h>
#include<conio.h>
#include<string.h>
void ChangeString(char Text[],int SCounter)
{
char *Ptr = Text;
int Length = strlen(Text);
for(;Counter<Length-2;Counter+=2,Ptr++)
{
*(Ptr+Counter)=toupper(*(Ptr+Counter));
void main()
{
int Position=0;
char Message[]="Pointers Fun";
ChangeString(Message, Position);
cout<<Message<<"@"<<Position;
}
Аnswer:
Output of the given program will be
PoiNteRs [email protected]
Question 23:
What will be the output of the following program?
#include<iostream.h>
#include<ctype.h>
#include<conio.h>
#include<string.h>
void NewtextCchar String[],int &Position)
{
char *Pointer=String;
int Length=strlen(String);
for(;Position<Length-2;Position+=2,Pointer++)
{
*(Pointer+Position)=toupper(*(Pointer+Position));
}
}
void main()
{
clrscr();
int Location=0;
char Message[]="Dynamic Act";
Newtext(Message, Location);
cout<<Message<<"#"<<Location;
}
Аnswer:
Output of the given program will be
DynAmiC ACt#10
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