Calculate The Area of Circle In C++

Source Code :

#include<iostream>

using namespace std;

int main()

{

 float r,area;

 cout<< "\nEnter radius of circle : ";

 cin>>r;

 area = 3.14*r*r;

 cout<<"Area of circle : "<<area;

 return 0;

}

Enter radius of circle : 7 < br/> Area of circle : 153.86