Jerry's Game (UVA 13056) by UKUNICHIA
Contest: 3738    RunID: 20175417    Status: Accepted    Date: Sat Oct 14 19:10:46 JST 2017


#include<bits/stdc++.h>
using namespace std;
using Int = long long;
signed main(){
  int T;
  cin>>T;
  for(int t=1;t<=T;t++){
    double r,v;
    cin>>r>>v;
    cout<<"Case "<<t<<": "<<fixed<<setprecision(8)<<acos(-1)*r/(v*2)<<endl; 
  }
  return 0;
}