Detect byte order (little/big endian)

byteorder.c

#include <stdio.h>

int main(void)
{
	const int data = 1;
	const char *const ptr = (char *)&data;

	if (*ptr == 1)
		puts("Little Endian");
	else if (*ptr == 0)
		puts("Big Endian");
	else
		fputs("Error\n", stderr);

	return 0;
}