判断某编译器是大端还是小端

//判断某编译器是大端还是小端
//法一：判断大小端
int Func()
{
int a = 0x12345678;
//0x78
char *pc = (char *)&a;
if (*pc == 0x78)
{
return 1;//小端
}
return 0;
}
//法二：判断大小端
int Func2()
{
int i = 1;//000000000000000000000000000001
char *pc = (char *)&i;
return pc;
//return ((char *)&i);
}
//法三：判断大小端（联合体）
//联合体 共用体(同一块内存)
int check()
{
union un
{
short sh;
char ch;
}u;//低地址开始共用内存
u.sh = 0x1234;//34 12
return u.ch;
}

int main()
{
int ret1 = check();
if (ret1 == 0x34)
{
printf(“is little\n”);
}

int ret = Func();
if (ret == 1)
{
	printf("is little\n");
}
	return 0;

}