Factorial.java

import java.util.Scanner;

public class Factorial {

    /**
    *   Program:    Factorial.java
    *   Purpose:    Yahoo! Answers. Find factorial of numbers between 1 and 12.
    *   Notes:      For bigger numbers, see my BigFactorial program
    *   Creator:    Chris Clarke
    *   Created:    22.05.2012
    */

    public static void main(String[] args) {
        Scanner keyboard = new Scanner(System.in);
        System.out.print( "Enter a number (between 1 and 12) for factorial: ");
        int n = keyboard.nextInt();
        if (n>12) {
            System.out.println ("Number too big!");
        } else if (n<1) {
            System.out.println ("Number too small!");
        } else {
            System.out.println( n + "! = " + factorial(n));
        }
    }

    public static int factorial(int n) {
        return (n == 1) ? 1 : n * factorial(n - 1);
    }
}