1.5_clear_all_bits.c

#include <unistd.h>

void	ft_putchar(char c)
{
	write(1, &c, 1);
}

void	ft_putnbr(int nb)
{
	if (nb == -2147483648)
	{
		ft_putchar('-');
		ft_putchar('2');
		nb = 147483648;
	}
	else if (nb < 0)
	{
		ft_putchar('-');
		nb *= -1;
	}
	if (nb > 9)
		ft_putnbr(nb / 10);
	ft_putchar(nb % 10 + '0');
}

/*
** a ^= a is equivalent to a = 0
*/

int		main(void)
{
	int a = 5;

	ft_putnbr(a);
	a ^= a;
	ft_putnbr(a);
	return (0);
}