/**
  * @author  mh
  * @version 1.0
  * @date 23.04.2012
  * @class fakultaet
  */
  
import java.util.Scanner;
class Fakultaet {
		
// iterativer Algm
static int itFak(int n) {
	int f=0;
	if (n<0 || n>12) {
		System.out.println ("unzulaessiger Wert");
	} else {
		f = 1;
		for (int i= 1;i<=n;i++) {
			f = f*i;
		} //for
	}
	return f;
} // itFak


// rekursiver Algm
static int rekFak(int n) {
	int f = 0;
	if (n<0 || n>12) {
		System.out.println ("unzulaessiger Wert");
	} else if (n==0) {	
		f = 1;
	} else {
		f = rekFak(n-1)*n;
	} // if
	return f;
} // rekFak


public static void main(String[] args) { 

	System.out.println(".. begin of fakultaet ..\n");
	Scanner in = new Scanner(System.in);
	
	System.out.print("Von welchem Wert n wollen Sie n! berechnen: ");
	int z = in.nextInt();
	
	System.out.println("iterativ, n: "+z+"  n!: "+itFak(z));
	System.out.println("rekursiv, n: "+z+"  n!: "+rekFak(z));

    System.out.println("\n.. end of fakultaet ..");
	
} // main

} // Fakultaet