alpha_mirror

Assignment name  : alpha_mirror
Expected files   : alpha_mirror.c
Allowed functions: write
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Write a program called alpha_mirror that takes a string and displays this string
after replacing each alphabetical character by the opposite alphabetical
character, followed by a newline.

'a' becomes 'z', 'Z' becomes 'A'
'd' becomes 'w', 'M' becomes 'N'

and so on.

Case is not changed.

If the number of arguments is not 1, display only a newline.

Examples:

$>./alpha_mirror "abc"
zyx
$>./alpha_mirror "My horse is Amazing." | cat -e
Nb slihv rh Znzarmt.$
$>./alpha_mirror | cat -e
$
$>

#include <unistd.h>

void	alpha_mirror(char *str)
{
	while (*str != '\0')
	{
		if (*str >= 'A' && *str <= 'M')
			*str = 'Z' - (*str - 'A');
		else if (*str >= 'a' && *str <= 'm')
			*str = 'z' - (*str - 'a');
		else if (*str >= 'N' && *str <= 'Z')
			*str = 'A' + ('Z' - *str);
		else if (*str >= 'n' && *str <= 'z')
			*str = 'a' + ('z' - *str);

		write(1, str, 1);
		++str;
	}
}

int		main(int argc, char **argv)
{
	if (argc == 2)
		alpha_mirror(argv[1]);

	write(1, "\n", 1);
	return (0);
}