uva 11636Hello World!

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水题

#include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
using namespace std;

int solve(int n){
    int ans = 0;
    int num = 1;
    while(num < n){
        ans++;
        num *= 2;
    }
    return ans;
}

int main(){
    int Case = 1 , n;
    while(scanf("%d" , &n) && n > 0)
        printf("Case %d: %d\n" , Case++ , solve(n));
    return 0;
}