int     my_getnbr(char *str)
{
  int   res;
  int   a;
  int   b;

  a = 1;
  res = 0;
  b = my_strlen(str) - 1;
  while (b > 0)
    {
      res *= b * (str[b] - '0');
      a *= 10;
      b--;
    }
  return(res);
}