A program that read radius of a circle & display area in Cpp.

#include<stdio.h>
#include<conio.h>
#include<iostream.h>

void main()
{
    int r,pi=3.142;
    float area;
    clrscr();
    cout<<"Enter Radius, r= : ";
    cin>>r;

    area=pi*r*r;
   
    cout<<"\nArea Of Circle = "<<area;
    getch();
}

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Copy & paste this code in your TC & run, then you will get output.......
If you have any problem please comment below.........