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package Algorithms.recursion;

import java.util.Stack;

public class Factorial {

public static void main(String[] strs) {

System.out.println(factorial(10));

System.out.println(factorialIterator(10));

}

public static int factorialIterator(Integer n) {

int ret = 1;

for (int i = n; i >= 1; i--) {

ret *= i;

}

return ret;

}

public static int factorial(Integer n) {

Stack<Integer> s = new Stack<Integer>();

s.push(n);

int ret = 1;

while (!s.isEmpty()) {

int cur = s.pop();

if (cur == 1) {

break;

}

ret *= cur;

s.push(cur - 1);

}

return ret;

}

}