UVa 579 - ClockHands

#include <stdio.h>
#include <stdlib.h>

int main()
{
	int H,M; 
	while ( scanf("%d:%d",&H,&M) && H+M ) {
		double m = M*6.0;
		double h = H*30.0+M*0.5;
		double a = h-m;
		if ( a <  0  ) a += 360.0;
		if ( a > 180 ) a = 360.0-a;
		printf("%.3lf\n",a);
	}
	return 0;
}