# -*- coding: utf-8 -*-
# Programme permettant de calculer la factorielle d'un nombre

def factoriel(n) :
    k = 1
    s  =1
    while k <= n:
        s = s *k
        k = k+1
    return s

def factoriel_recursif(n):
    s = n
    if n == 1 :
        s = 1
    else :
        s = s * factoriel_recursif(n-1)
    return s