UVa 579 ClockHands

想法：
　　題目很長但只是時針和分針夾角幾度，先將時針指的地方換成分鐘表示，然後時針分針相減後換成角度表示即可。

	#include <cstdio>
	using namespace std;
	double Abs(double a) { return a<0 ? -a : a; }
	int main()
	{
	int H,M;
	while (scanf("%d:%d",&H,&M) != EOF){
	if (!H && !M) break;
	double H_minute = (double(H) + double(M)/60) * 5; // 將時針換成分鐘表示
	double M_minute = double(M);
	double diff = Abs(H_minute - M_minute);
	while (diff >= 60) diff -= 60;
	if (diff > 30) diff = 60 - diff;
	printf("%.3f\n", diff * 6); // 一分鐘6度
	}
	return 0;
	}

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