C / C++ / MFC

class CFloat128
{
public:
    CFloat128(unsigned __int64 uLowOrder, 
              unsigned __int64 uHighOrder = 0,
              bool bNegative = false);
    ~CFloat128();

// your operations
private:
    void* m_pData;
};

// overloaded operators
CFloat128 operator + (const CFloat128& lFloat, const CFloat128 rFloat);
// etc..

WSAEACCES
10013
Permission denied.

An attempt was made to access a socket in a way forbidden by its access permissions. An example is using a broadcast address for sendto without broadcast permission being set using setsockopt(SO_BROADCAST).
Another possible reason for the WSAEACCES error is that when the bind function is called (on Windows NT 4 SP4 or later), another application, service, or kernel mode driver is bound to the same address with exclusive access. Such exclusive access is a new feature of Windows NT 4 SP4 and later, and is implemented by using the SO_EXCLUSIVEADDRUSE option.