/* file: Factorial.java
 *
 *	Basic Algorithms, V22.0310.003, Fall98 (Yap)
 *	Modified: Fall99
 *	$Id: Factorial.java,v 1.1 1999/09/14 21:58:46 yap Exp yap $
 *
 * Factorial computes the factorial function
 * It also illustrates the processing of command line arguments.
 *
 * The main function expects an integer whose factorial will be
 * computed.  If you put this file in a file called Factorial.java,
 * then you can compile and run this program as follows:
 *
 *        % javac Factorial.java
 *        % java Factorial 5
 * 
 *  The program will then compute 5! (=120)
 */
class Factorial {

  static int computeFactorial(int k) {		// factorial function
    if (k<0) return -1;
    else if (k == 0 || k == 1) return 1;
    else return k * computeFactorial(k-1);
  } // computeFactorial

  public static void main(String[] args) {	// main function
    int n;
    n = Integer.parseInt(args[0]);
    for (int i = 0; i <= n; i++)
	System.out.println
	  (i + " factorial is " + computeFactorial(i));
  } // main
}