判断大小端的几种方法

bool check()
{
    union u {
        int a;
        char b;
    } c;

    c.a = 1;
    return (c.b == 1); //小端返回true, 大端返回false
}

bool check()
{
    int i = 1;
    unsigned char *p;
    p = (unsigned char *)&i;

    return *p; //小端返回true, 大端返回false
}

bool check()
{
    short a=0x0061;
    return ((char)a == 'a'); //小端返回true, 大端返回false
}