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https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=2683
#include<cstdio>
int main()
{
int a[20] = {0}, cas = 1, n;
a[0] = 1, a[1] = 2;
for (int i = 2; i<20; i++)
a[i] = a[i-1]*2;
while (scanf("%d", &n) && n >= 0){
for (int i = 0; i<20; i++){
if (n <= a[i]){
printf("Case %d: %d\n", cas, i);
break;
}
}
cas++;
}
}
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