program to calculate area of circle

following is code for calculating area of circle with user input and without.


  • code taking input from user:-


#include<iostream.h>
void main()
{
int r;
float pi,a;
pi=(float)22/7;
cout<<"enter the value of r i.e radius";
cin>>r;
c=pi*r*r'
cout<<"Area of circle is ="<<a;
}



  • code without taking input from user:-


#include<iostream.h>
void main()
{
int r;
float pi,a;
pi=(float)22/7;
r=7;
c=pi*r*r;
cout<<"Area of circle is="<<a;
}



note:-it's just a sudo code if its not executing on your device make some changes in the further code this is only for understanding logic.

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