winapi - Basic Windows Programming question in VS2005 -

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I created a Win32 console application (without enabling precompiled header option). And now my source code is, in this form, there are two compiler errors 

  // AFormattingMsgBox.cpp: defines the entry point for the console application. // # include & lt; Windows.h & gt; #include "stdafx.h" // integer _tmain (int argc, _TCHAR * argv []) integer APIENTRY WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, integer iCmdShow) {int cxScreen, cyScreen; CxScreen = GetSystemMetrics (SM_CXSCREEN); CyScreen = GetSystemMetrics (SM_CYSCREEN); Messagebox printf (TEXT ("ScrSize"), text ("% i pixels wide by screen% i pixels wide is high"), cxScreen, cyson); Return 0; } CDECL MessageBoxPrintf (TCHAR * szCaption, TCHAR * szFormat, int x, int y) {TCHAR szBuffer [1024] int i; Va_list pArgList; Va_start (parlist, SJ format); _vsntprintf (szBuffer, sizeof (szBuffer) / sizeof (TCHAR), szFormat, pArgList); Va_end (pArgList); Return messagebox (tap, esbuffer, sj caption, 0); }   
 compiler errors.  
 
 Error C3861: 'Message Box VIP': Identifier not found  
 Error C2365: 'MessageBoxPrintf': redefinition; The previous definition was' previously unknown identifier   
 I can fix errors. Thanks for your reading and reply.   
 
 
 Enter a prototype or WinMain before either insert the Function MessageBoxPrintf before the WinMain function. You enter a prototype by entering the following line:  
  int CDECL messagebox counter (TCHAR * Sz captions, TCHAR * sfformat, int x, int y);

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