Light OJ 1216

#include<bits/stdc++.h>
#include<stdio.h>
#include<math.h>
#include<cmath>
#define pi 2*acos(0.0)
using namespace std;

int main()
{
    int t,i;
    cin>>t;
    for(i=1;i<=t;i++){
        double r1,r2,h,p,x,r,v;
        cin>>r1>>r2>>h>>p;
        x=(h*r2)/(r1-r2);
        r=(r2*(p+x))/x;
        v=(pi*((r*r*(p+x))-(r2*r2*x)))/3;
        printf("Case %d: %lf\n",i,v);
    }
    return 0;
}