NCERT Solutions Class 12 Computer Science (C++) Chapter -7 (Pointers)

NCERT Solutions Class 12 Computer Science (C++) from class 12th Students will get the answers of Chapter-7 (Pointers) This chapter will help you to learn the basics and you should expect at least one question in your exam from this chapter.

We have given the answers of all the questions of NCERT Board Computer Science (C++) Textbook in very easy language, which will be very easy for the students to understand and remember so that you can pass with good marks in your examination.

NCERT Question-Answer

Class 12 Computer Science (C++)

Chapter-7 (Pointers)

Questions and answers given in practice

Chapter-7 (Pointers)

Very Short Answer Type Questions [1 mark each]

Question 1:
Write the definition of a function FixPay (float Pay[ ], int N) in C+ + , which should modify each element of the array Pay having N elements, as per the following rules :

Existing Salary Value	Required Modification in Value
If less than 1,00,000	Add 25% in the existing value
If >=1,00,000 and <20,000	Add 20% in the existing value
If >=2,00,000	Add 15% in the existing value

Answer:

Void FixPay(float Pay[],int N)
{
for(int i=0;i<N;i++)
{
if(Pay[i]<100000)
Pay[i]+= Pay[i]*0.25;
else if(Pay[i]<200000)
Pay[i]+= Pay[i]*0.20; 
else
Pay[i]+= Pay[i]*0.15 ;
 }
}

Question 2:
Write the definition of a member function INSERT() for a class QUEUE in C+ +, to remove a product from a dynamically allocated Queue of items considering the following code is already written as a part of the program.

Struct ITEM 
{
int INO; char INAME[20];
ITEM*Link;
};
class QUEUE 
{
ITEM *R,*F;
Public:
QUEUE(){R=NULL; F=NULL;}
void INSERT();
void DELETE();
~QUEUE();
};

Answer:

Void QUEUE::INSER()
{
ITEM*newitem = new ITEM; 
Cout<<"enter item number";
cin>>newitem → INO;
Cout<<"Enter item name";  
gets(newitem → INAME); 
newitem → Link = NULL; 
if (R==NULL)
R=F=newitem;
else
{
 R → Link=newitem; 
 R = newitem;
}

Short Answer Type Questions-I

Question 1:
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++); 
fortint 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;
 }

Answer:
Text = tMKCM@lMJGCR
New Text = KCM@1MJGCR
Last Text = 1MJGCR

Question 2:
Obtain the output of the following C+ + program as expected to appear on the screen after its execution.
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[]={l,5,7,9}
P=Num;
cout <<*p<< Text <<endl;
Text++;
P++;
cout<<*P<<Text<<endl;
}

Answer:
1AJANTA
5JANTA

Question 3:
Obtain the output from the following C+ + program as expected to appear on the screen after its execution.
Important Note :
• Adi 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[]={1,5,7,9}; 
ptr=a;
cout<<*ptr<<String<<endl;
String++; 
ptr+=3;
cout<<*ptr<<String<<endl;
}

Answer:
1 SARGAM
9ARGAM

Question 4:
Give the output of the following program segment: (Assuming all desired header file(s) are already included)

void main()
{
float *Ptr, Points[] = {20,50,30,40,10};
Ptr = points; 
cout<<*Ptr<<endl;
Ptr+=2;
Points[2]+=2.5; 
cout<<*Ptr<<endl;
Ptr++;
(*Ptr)+=2.5; 
cout<<Points[3]<<endl;
}

Answer:
20.00 32.5
42.50

Question 5:
Find the output of the following code :
Important Note :
All the 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;
}

Answer:
10SHAKTI
15HAKTI

Question 6:
Write the output of the following C+ + program code :
Note : Assume all required header files are already being included in the program.

void change(int*s)
{
for(int i=0;i<4;i++)
{
if(*s<40)
{
if(*s%2==0)
*s=*s+10; 
else
*s=*s+ll; 
}
else
 {
if(*s%2==0)
*S=*S-10; 
else
*s=*s-ll;
}
cout<<*s<<" ";
s++;
}
}
void main()
{
int score[]={25,60,35,53 }; 
change(score);
}

Answer:
36 50 46 42

Short Answer Type Question-II

Question 1:
Find the output of the following program :

#include<iostream.h>
void in(int x,int y,int &z)
{
x+=y; 
y--;
z*=(x-y);
}
void out(int z,int y,int &x)
{
x*=y;
y++;
z/=(x+y);
}
void main()
{
int a=20, b=30, c=10;
out(a,c,b);
cout<<a<<"#"<<b<<"#"<<c<<"#"<<endl; 
in(b,c, a) ;
cout<<a<<"®"<<b<<"@"<<c<<"@"<<endl; 
out(a,b,c);
cout<<a<<"$"<<b<<"$"<<c<<"$"<<endl;
}

Answer:
20#300#10#
620@300@10@
620$300$3000$

Long Answer Type Questions

Question 1:
Find the output of the following code:

#include<iostream.h> 
void main()
{
int *Striker;
int Track[]={10,25,30,55}; 
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"<<*Track[0]<<endl;
}

Answer:
Striker 10
Next@55
Last@55
Rest To 0

Question 2:
Find the output of the following code :

#include<iostream.h> 
void main()
{ 
int *Queen;
Moves[]={ll,22,33,44};
Queen=Moves;
Moves[2]+=22;
cout<<"Queen@"<<*Queen<<endl; 
*Queen-=ll;
Queen+=2;
cout<<”Now@"<<*Queen<<endl; 
Queen++;
cout<<"Finally@"<<*Queen<<endl;
cout<<"NewOrigin@"<<*Moves[0]<<endl; 
}