check_order.c

#include<stdio.h>

typedef union{
		unsigned short int value;
		unsigned char byte[2];
}to;

int main(int argc,char *arg[])
{
		to typeorder;
		typeorder.value = 0xabcd;

		if(typeorder.byte[0]==0xcd && typeorder.byte[1]==0xab)
		{
				printf("Low endian byte order"
						"byte[0]:0x%x,byte[1]:0x%x\n",typeorder.byte[0],typeorder.byte[1]);
		}

		if(typeorder.byte[0]==0xab && typeorder.byte[1]==0xcd)
		{
				printf("High endian byte order"
						"byte[0]:0x%x,byte[1]:0x%x\n",typeorder.byte[0],typeorder.byte[1]);
		}
		
		return 0;
}