LightOj 1022 Circle in Square Solution

                                           

Problem Link:https://lightoj.com/problem/circle-in-square

Solution in C++:

///La ilaha illellahu muhammadur rasulullah

///******Bismillahir-Rahmanir-Rahim******///

///Abul Hasnat  Tonmoy

///Department of CSE,23rd batch

///Islamic University,Bangladesh

#include <bits/stdc++.h>

using namespace std;

int main()

{

    int  i=1,t;

    double r,a,sa,ans;

    double pi = 2*acos(0.0);

    cin>>t;

    while(t--)

    {

        cin>>r;

        a=2*r;

        sa=a*a;

        ans=sa-(pi*r*r);

        printf("Case %d: %.2lf\n",i++,ans);

    }

}