二者很明显的区别，dos和gui

字符模式模型

#include "stdafx.h"

int _tmain(int argc, _TCHAR* argv[])
{  
 printf("Hello World!");
 getchar();
 return 0;
}

windows等价程序

#include <Windows.h>

int WINAPI WinMain( __in HINSTANCE hInstance, __in_opt HINSTANCE hPrevInstance, __in_opt LPSTR lpCmdLine, __in int nShowCmd )
{
 MessageBox(NULL,"Hello World!","HelloMsg",MB_OK);
 return 0;
}