Write a Program to Find The Area of a Circle,Given The Radius

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

void main()
{
 clrscr();

  int r;
  float P=3.14,area;
  cout<<" enter the radious of a circle  ";
  cin>>r;
  area=P*r*r;

  cout<<"The Area of Circle is"<<"= "<<area;
       getch();

}