///////    Factorial.java    ///////

/**
 * Lists n factorial for n from 0 to 12.
 * Usage:  java Factorial
 */
public class Factorial
{  
    public static int factorial(int n)
    {  int ans = 1;
       while (n > 1)
       {    ans = ans * n;
            n = n - 1;
       } 
       return ans;
    }

    public static void main(String[] args)
    {   int n = 0;
        while ( n < 13 )
        {  System.out.print(n + "! = ");
           System.out.println(factorial(n));
           n = n + 1;
        }
    }
}