C / C++ / MFC

int x=1, y=5; 
x^=y^=x^=y; // whats the content of x and y now?
<a href="http://www.codeproject.com/useritems/StupidXORTrick.asp" target="_blank">ClickHereForHelp();</a>

#include "stdafx.h"
#include "UDPSocket.h"

#include "MainFrm.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CUDPSocket

CUDPSocket::CUDPSocket()
{
}

CUDPSocket::~CUDPSocket()
{
}


//Die folgenden Zeilen nicht bearbeiten. Sie werden vom Klassen-Assistenten benötigt.
#if 0
BEGIN_MESSAGE_MAP(CUDPSocket, CAsyncSocket)
	//{{AFX_MSG_MAP(CUDPSocket)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()
#endif	// 0

/////////////////////////////////////////////////////////////////////////////
// Member-Funktion CUDPSocket 

void CUDPSocket::SetParent(CFrameWnd *pWnd)
{
	m_pWnd = pWnd;
}

void CUDPSocket::OnReceive(int nErrorCode)
{
	if (nErrorCode == 0)
		((CMainFrame*)m_pWnd)->OnReceive();
}

// ... add more events here

#if !defined(AFX_UDPSOCKET_H__B455316B_592B_4066_B909_F961153C0A61__INCLUDED_)
#define AFX_UDPSOCKET_H__B455316B_592B_4066_B909_F961153C0A61__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
// UDPSocket.h : Header-Datei
//



/////////////////////////////////////////////////////////////////////////////
// Befehlsziel CUDPSocket 

class CUDPSocket : public CSocket
{
// Attribute
public:

// Operationen
public:
	CUDPSocket();
	virtual ~CUDPSocket();

public:
	void SetParent(CFrameWnd *pWnd);

protected:
	virtual void OnReceive(int nErrorCode);
private:
	CFrameWnd* m_pWnd;
};

#endif

CUDPSocket sock;
//setup the socket
sock.Listen();

#include <vector>
#include <iostream>

using std::cout;
using std::vector;
// or just: using namespace std; instead of both of the above