collatz conjecture

//This is a simple program that computes the Collatz Conjecture of numbers input by the user
//3-07-14
import java.util.Scanner;
public class CollatzConjecture
{
   public static void main(String[] args)
   {
      System.out.println("Enter an integer to see its Collatz Conjecture,\nEnter 0 to exit:");
      Scanner scan = new Scanner(System.in);
      int num;
      while(true)
      {
         num = scan.nextInt();
         if(num==0)     break;
         if(num%2==0)   System.out.println("Collatz Conjecture of " + num + " = " + num/2);
         else           System.out.println("Collatz Conjecture of " + num + " = " + (num*3+1));
      }
   }
}