判断大端小端函数

int big_endian();
int little_endian();

int _tmain(int argc, _TCHAR* argv[])
{
    int iBigEndian = big_endian();
    int iLittleEndian = little_endian();
    return 0;
}

int big_endian()
{
    union
    {
        long l;
        char c[sizeof(long)];
    }u;

    u.l = 1;
    return u.c[sizeof(long) - 1] == 1;
}

int little_endian()
{
    union
    {
        long l;
        char c;
    }u;

    u.l = 1;
    return u.c == 1;
}