C / C++ / MFC

switch (i)
{
case 0:
case 1:
case 2:
...
case 20:
   // do something
   break;
case 21:
case 22:
... 
case 450:
   // do something
   break;
}

if (/* i is in range 1 */)
   // do something
else if (/* i is in range 2 */)
   // do something else
else
   // do something else else

1. Yes, if you use Pascal instead of C/C++ . (Silly answer).
   
   
2. You can also use GetWindowPlacement() for the general case, but IsZoomed() as pointed out earlier, is definitely easier.
   
   
3. In general, you need to override the control's WM_PAINT handler to "do the right thing", i.e. display the numbers in an appropriate format. You can use Chris' grid control, but if you want your class to be lightweight, you'll probably want to just override OnPaint().

void AFX_CDECL CString::Format(LPCTSTR lpszFormat, ...)
{
	ASSERT(AfxIsValidString(lpszFormat));

	va_list argList;
	va_start(argList, lpszFormat);
	FormatV(lpszFormat, argList);
	va_end(argList);
}