algorithm exercise

reciprocal_square_summation.cpp

#include <stdio.h>

int main()
{
	auto T = 1;
	auto n = 0, m = 0;
	while (~scanf("%d%d", &n, &m))
	{
		if (n == 0 && m == 0)
		{
			break;
		}

		auto sum = 0.0;
		for (auto num = n; num <= m; num++)
		{
			auto reciprocal = 1.0 / num / num;
			sum += reciprocal;
		}

		printf("Case %d: %.5lf\n", T, sum);
		T++;
	}
	return 0;
}