【UVa】11636 - Hello World!

Solution

#include <iostream>
using namespace std;

int main(){

int n;
int kase = 1;
while(cin >> n){
if(n < 0)
break;

int ans = 1;
int cnt = 0;
while(ans < n){
ans = ans * 2;
cnt++;
}
cout << "Case " << kase++ << ": " << cnt << endl;
}
return 0;
}