1.

/**
 *
 * Problem #579 - Clock Hands
 * http://uva.onlinejudge.org/external/5/579.pdf

 *
 * @author Mariya Vlaseva
 *
 * Status : Accepted

 * Runtime: 2.528
 */

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.text.DecimalFormat;
import java.util.Locale;


public class Main {


    /**
     * @param args
     * @throws IOException 
     */
    public static void main(String[] args) throws IOException {
        BufferedReader console = new BufferedReader(new InputStreamReader(System.in));

        
        for(String line = console.readLine(); line != null; line = console.readLine()) {
            if (line.equals("0:00")){
                    break;
            }        
            String[] splittArray = line.split(":");

            int h= Integer.parseInt(splittArray[0]);
            int m = Integer.parseInt(splittArray[1]);
            
            double result = (h*30+(m/60.0)*30)-m*6;
            if (result<0){
                result=360+result;

            }
            if (result> 180){
                result=360-result;
            }

            DecimalFormat format =
                  (DecimalFormat)DecimalFormat.getInstance(Locale.US );

                format.applyPattern( "#,###0.000" );
            
            System.out.println(format.format(new Double(result)));
            }
        }

    }


2. 

/**
 * FWP, Ausgewählte Probleme aus dem ACM Programming Contest, SS10
 * Problem: 579 Clock Hands
 *
 * @author Robert Reichart
 *
 * Status : Accepted
 * Runtime: 2.164
 */

import java.io.*;
import java.text.*;
class Main{
    static BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    public static void main(String... args){
        try{
            String line = readLine();
            while(!line.equals("0:00")){
                //System.out.println(line);
                String[] hm = line.split(":");
                int h=Integer.parseInt(hm[0]);
                int m=Integer.parseInt(hm[1]);

                double HAnglePM = 0.5;
                
                double HAnglePH = 30;
                
                double MAnglePM = 6;
                
                double MAngle=m*MAnglePM;
                //System.out.println("MAngle= " + MAngle);
                double HAngle=h*HAnglePH+m*HAnglePM;
                //System.out.println("HAngle= " + MAngle);
                double angle=Math.abs(HAngle-MAngle);
                if(angle>180){angle=360-angle;}
                DecimalFormat df =   new DecimalFormat  ( "0.000" );
                //System.out.println("angle=" + angle);

                System.out.println(df.format(angle));
                line=readLine();
            }
        }catch(Exception ex){}
    }

    static String readLine(){
        try{
            String line=in.readLine();
            while(line.equals("")){
                line=in.readLine();
            }
            return line;
        }catch(Exception ex){return null;}
    }
}