Big-Endian 和 Little-Endian 判断

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

/* 程序输出 78 56 34 12，即采用小端存储 */
static void show_bytes(unsigned char* pucStart, int iLen)
{
	int i = 0;

	for (; i < iLen; i++)
	{
		printf("%.2x\n", *(pucStart + i));
	}

	return ;
}

/* 程序输出 78 56 34 12，即采用小端存储 */
static void show_bytes2(int iTmp, int iLen)
{
	int i = 0;
	union
	{
		int iTmp;
		char ucTmp[4];
	}uTmp;

	memset(&uTmp, 0, sizeof(uTmp));
	uTmp.iTmp = iTmp;

	for (; i < iLen; i++)
	{
		printf("%.2x\n", uTmp.ucTmp[i]);
	}
}

int main(int argc, char **argv)
{
	int iTmp = 0x12345678;

//	show_bytes((unsigned char *)(&iTmp), sizeof(int));

	show_bytes2(iTmp, sizeof(int));

	return 0;
}