C - Recursion - Classical recursion of a factorial

A classical example of recursions is of course the factorial one.

If you want to know the result of a factorial, do not hesitate to use a recursive function.

Let's see it:

#include        <stdio.h>

int     doIt(int nb) {
  if (nb <= 1)
    return 1;
  printf("nb = %d\n", nb);
  return nb * doIt(nb - 1);
}

int     main() {
  int first = 5;

  printf("Last = %d\n", doIt(first));
  return 0;
}

The render:

nb = 5
nb = 4
nb = 3
nb = 2
Final result = 120