ft_iterative_factorial 구현하기

#include <unistd.h>

int	ft_iterative_factorial(int nb)
{
	int	num;

	num = nb - 1;
	if ((nb == 0) || (nb == 1))
		return (1);
	if (nb < 0)
		return (0);
	while (num > 0)
	{
		nb = nb * num;
		num--;
	}
	return (nb);
}