تمرین تبدیل کیلومتر به متر در جاوا

package project22day;

import java.util.Scanner;

public class Tamrin3 {

   public static void main(String[] args) {
       Scanner in = new Scanner(System.in);
       while (true) {
           System.out.println("Please enter the distance");
           double m = in.nextDouble();
           if (m == 0) {
               System.err.println("End");
               break;
           }
           double convert = m * 1000;
           System.out.println("Distance in meters: " + convert );
       }
   }

}

Please enter the distance
19
Distance in meters: 19000.0
Please enter the distance
6
Distance in meters: 6000.0
Please enter the distance
5
Distance in meters: 5000.0
Please enter the distance
0
End