判断字节序

#include<stdio.h>

typedefunion
{
unsignedshortintvalue;
unsignedcharbyte[2];
}to;

intmain(intargc,char*argv)
{
to typeorder;
typeorder.value=0x1234;

if(typeorder.byte[0]==0x12 &&typeorder.byte[1]==0x34)
{
printf("Big endian byte order!\n");
}
if(typeorder.byte[0]==0x34 &&typeorder.byte[1]==0x12)
{
printf("Little endian byte order!\n");
}
return0;
}