Interview Question for Software Engineer at Cisco Systems:

package com.homeaway.omapi.dao.mybatis;

public class Factorial {

    public int factiorailIter(int n){
        int res = 1;
        if (n == 0){
            return 1;
        }
        while (n > 0){
            res *= n--;
        }
        return res;
    }
    public int factorialRec(int n){
        if (n ==0){
            return 1;
        }
        else {
            return n * factorialRec(n-1);
        }

    }

    public static void main (String[] args){
        Factorial f = new Factorial();
        System.out.println(f.factiorailIter(5));

        System.out.println(f.factorialRec(5));
    }
}