Area of Circle in C++

C++ PROGRAM TO FIND THE AREA OF CIRCLE

Sample Test Case    :    Enter radius of circle  : 5

Sample Test Case    :    Area of circle : 78.5

CODE

#include <iostream.h>

using namespace std;

int main()

{

    float r,area;

    cout<<"Enter Radius of circle :";

    cin>>r;

    area=3.14*r*r;

    cout<<"Area of circle :"<<area;

    return 0;

}