UVa [579 - Clock Hands] by Go-Ice

/*
    Author: LinChuWen
    Date: 2014/10/05
    UVa Online Judge Problem #579 - Clock Hands
    Description: The output displays the smallest positive angle in degrees between the hands for each time.
             The answer should between 0 degrees and 180 degrees for all input times.
             Display each angle on a line by itself in the same order as the input.
             The output should be rounded to the nearest 1/1000.
*/
#include <stdio.h>
#include <stdlib.h>

int main(){
    int h,m;
    float dh,dm,answer;

    while(scanf("%d:%d",&h,&m)==2){
        if(h==0 && m==0)
            break;

        dh=h*30+m*0.5;
        dm=m*6;

        answer=dh-dm;
        if(answer<0)
            answer=-answer;
        if(answer>180)
            answer=360-answer;

        printf("%.3f\n",answer);
    }

    system("PAUSE");
    return 0;
} /* main end */