Recursivité

#include <stdio.h>

unsigned int factoriel (unsigned int);

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

unsigned int factoriel (unsigned nb){
  if (nb < 2)
    return 1;
  else
    return nb * factoriel (nb - 1);
}

#include <stdio.h>

unsigned int factoriel (unsigned int, unsigned int);

int main ()
{
  int nb;
  printf ("Entrez un numéro entier : ");
  scanf ("%u", &nb);
  printf ("%u! = %u\n", nb, factoriel (nb,1));
  return 0;
}

unsigned int factoriel (unsigned nb, unsigned n){
  if (nb == 0)
    return 1;
  else if (nb == 1)
    return n;
  else
    return factoriel(nb - 1, nb * n);
}