CPP Program to Calculate Area of Circle

//Write a program to calculate area of circle.

#include<iostream.h>

#include<conio.h>

void main()

{

 clrscr();

 float r,area;

 cout<<"Enter radius -";

 cin>>r;

 area=3.14*r*r;

 cout<<"Area of circle -"<<area;

 getch();

}

Output: