Thinking in Java Fourth Edition Bruce Eckel Chapter 4 Exercise 21

public class EnumEx21
{
    public enum Bills
    {
        ONE, FIVE, TEN, TWENTY, FIFTY, HUNDRED
    }
    public static void main(String[] args)
    {
        for(Bills b : Bills.values())
            System.out.println(b + ", ordinal " + b.ordinal());
    }  
}