CBSE Class 12 Computer Science (C++) Chapter 7 Pointers Important Questions – Free PDF Download
Free PDF download of Important Questions for CBSE Class 12 Computer Science (C++) Chapter 7 Pointers prepared by expert Computer Science (C++) teachers from latest edition of CBSE(NCERT) books, On CoolGyan.Org to score more marks in CBSE board examination.
CBSE Class 12 Computer Science (C++) Important Questions
Chapter 7 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<<"Next@"<<*Striker<<endl; Striker += 2; cout<<"Last@"<<*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
Next@55
Last@55
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<<"Now@"<<*Queen<<endl; Queen++; cout<<"Finally@"<<*Queen<<endl; cout<<"New 0rigin@"<<*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
Now@55
Finally@44
New 0rigin@0
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
2@4@8@
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#
12@18@30@36@
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<<"
"; value=*arptr++; cout<<value<<"
"; value=*arptr; cout<<value<<"
"; value=*++arptr; cout<<value<<"
"; }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 Fun@10
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