C / C++ / MFC

#include <htmlhelp.h>

...

HWND	ShowHelpPage (LPCSTR szPageName, LPCSTR szAnchor)
{
	CString	helppage = CGlobals::GetExeDirectory ();
	helppage += "XXXX.chm";
	if (szPageName && ::lstrlen (szPageName))
	{
		helppage += "::/";
		helppage += szPageName;
		helppage += ".htm";
		if (szAnchor && ::lstrlen (szAnchor))
		{
			helppage += "#";
			helppage += szAnchor;
		}
	}

	HWND hReturn = ::HtmlHelp(::GetDesktopWindow (), helppage, HH_DISPLAY_TOPIC, NULL);

	return hReturn;
}

int a=0;
int& b=a; // b is a new name for a
b=1;
cout<<a; // outputs 1

void f(int i)
{
  i=1;
}
 
int a=0;
f(a);
cout<<a; // outputs 0!

void f(int& i)
{
  i=1;
}
 
int a=0;
f(a);
cout<<a; // outputs 1