UVa [579 - Clock Hands] by Go-Ice

/**
 * Date: 2014.10.09
 * @author LinChuWen
 * 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.
 */
import java.util.*;
public class UVa_579 {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        String time,str_h,str_m;
        int h,m;
        int length;
        float dh,dm,answer;

        while(input.hasNext()){
            time = input.nextLine();
            length = time.length();
            str_m = time.substring(length-2, length);
            str_h = time.substring(0, length-3);
            m = Integer.parseInt(str_m);
            h = Integer.parseInt(str_h);

            if(h==0 && m==0)
                break;

            dh=(float) (h*30+m*0.5);
            dm=(float) (m*6.0);

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

            System.out.printf("%.3f\n",answer);
        } //big while end
        input.close();
    } //main end
} //class end