public class Fakultaet {

	public static long fakIter(int n) {
		long result = 1;
		while (n > 1) {
			result *= n;
			n--;
		}
		return result;
	}

	public static long fakIter2(int n) {
		long result = 1;
		int i = 1;
		while (i <= n) {
			result *= i;
			i++;
		}
		return result;
	}
	
	
	public static long fakRek(int n) {
		// Abbruchbedingung:
		if (n == 0)
			return 1;
		
		// Rekursiver Aufruf:
		return n * fakRek(n-1);
	}
	
	
	public static long fakRek2(int n) {
		return fakRek2Helper(1, n);
	}
	
	public static long fakRek2Helper(int i, int n) {
		if (i == n)
			return n;
		
		return i * fakRek2Helper(i+1, n);
	}
	
}