NCERT Solutions for Class 12 Computer Science (C++)

<div class=”entry-content” style=”height: auto !important;”><h2>NCERT Solutions for Class 12 Computer Science (C++) – Pointers</h2>
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 :<div class=”code-block code-block-1″ style=”margin: 8px 0; clear: both;”>
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<table border=”2″>
<tbody>
<tr>
<td style=”padding-left: 30px;”>Existing Salary Value</td>
<td style=”padding-left: 30px;”>Required Modification in Value</td>
</tr>
<tr>
<td style=”padding-left: 30px;”>If less than 1,00,000</td>
<td style=”padding-left: 30px;”>Add 25% in the existing value</td>
</tr>
<tr>
<td style=”padding-left: 30px;”>If >=1,00,000 and <20,000</td>
<td style=”padding-left: 30px;”>Add 20% in the existing value</td>
</tr>
<tr>
<td style=”padding-left: 30px;”>If >=2,00,000</td>
<td style=”padding-left: 30px;”>Add 15% in the existing value</td>
</tr>
</tbody>
</table>
Аnswer:
<pre>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 ;
}
}</pre>
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.
<pre>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();
};</pre>
Аnswer:
<pre>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;
}</pre>
Short Answer Type Questions-I
Question 1: 
Write the output from the following C+ + program code :
<pre>#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;
}</pre>
Аnswer: 
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.
<pre>void main()
{
char *Text=”AJANTA”; int *P, Num[]={l,5,7,9}
P=Num;
cout <<*p<< Text <<endl;
Text++;
P++;
cout<<*P<<Text<<endl;
}</pre>
Аnswer: 
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.
<pre>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;
}</pre>
Аnswer: 
1 SARGAM 
9ARGAM
Question 4: 
Give the output of the following program segment: (Assuming all desired header file(s) are already included)
<pre>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;
}</pre>
Аnswer: 
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.
<pre>void main()
{
char *String=”SHAKTI”;
int*Point,Value[]={10,15,70,19};
Point=Value;
cout<<*Point<<String<<endl;
String++;
Point++;
cout<<*Point<<String<<endl;
}</pre>
Аnswer: 
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.
<pre>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);
}</pre>
Аnswer: 
36 50 46 42
Short Answer Type Question-II
Question 1: 
Find the output of the following program :
<pre>#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;
}</pre>
Аnswer: 
20#300#10# 
620@300@10@ 
620$300$3000$
Long Answer Type Questions
Question 1: 
Find the output of the following code:
<pre>#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;
}</pre>
Аnswer: 
Striker 10 
Next@55 
Last@55 
Rest To 0
Question 2: 
Find the output of the following code :
<pre>#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;
}</pre>
Аnswer: 
Queen@11 
Now@55 
Finally@44 
NewOrigin@0

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NCERT Solutions for Class 12 Computer Science (C++) – Pointers

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