版权声明:有善始者实繁,能克终者盖寡。 https://blog.csdn.net/weixin_43987810/article/details/86438786
#include<stdio.h>
int main()
{
int n, m;
int cnt = 1;
while(scanf("%d%d", &n, &m) && m > 0 && n > 0)
{
double sum = 0;
for(int i = n; i <= m; i++)
sum += 1.0 / i / i;
printf("Case %d: %.5lf\n", cnt, sum);
cnt++;
}
return 0;
}