Main.java

public class Main {

    public static void main(String[] args) {
        System.out.println("fakuiter ist: " + fakuIter(4));
        System.out.println("fakureku ist: " + fakuReku(4));
    }

    static int fakuIter(int n){
        int ergebnis = 1;
        for (int i = 1; i <= n; i++) {
            ergebnis *= i;
        }
        return ergebnis;
    }

    static int fakuReku(int n){
        if (n == 1)
            return n;
        
        return n*fakuReku(n-1);
    }
}