FACTORIELE EN C

int factoriel(int x)
{
     if(x==0)
        return 1;
   return (x * factoriel(x-1));
}

#include<stdio.h>
int factoriel(int nb);

int main ()
{
  int nb;
  printf("Entrez un nombre entier : ");
  scanf("%d",&nb);
  printf("%d factoriel = %d\n",nb,factoriel(nb));
  return 0;
}

int factoriel(int nb){
        int i,res;
        res = 1;
        for (i=2;i<=nb;++i)
                res = res * i;
        return res;
}