uri 1002 solution in cpp

uri 1002 solution in cpp

by ujjal roy

#include<bits/stdc++.h>

using namespace std;

main()

{

   double r,ans;

    cin>>r;

    ans=3.14159*r*r;

    cout<<"A="<<fixed<<setprecision(4)<<ans<<endl;

    return 0;

}