#include <iostream>    
using namespace std;
void main()
{    
    cout << "Hello World!\n";    
    cin.get();
}

#include <windows.h>

LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);

char szClassName[ ] = "WindowsApp";

int WINAPI WinMain (HINSTANCE hThisInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR lpszArgument,
                     int nFunsterStil)

{
     HWND hwnd;
     MSG messages;
     WNDCLASSEX wincl;  

     wincl.hInstance = hThisInstance;
     wincl.lpszClassName = szClassName;
     wincl.lpfnWndProc = WindowProcedure;  
     wincl.style = CS_DBLCLKS;  
     wincl.cbSize = sizeof (WNDCLASSEX);
     wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
     wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
     wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
     wincl.lpszMenuName = NULL;          
     wincl.cbClsExtra = 0;            
     wincl.cbWndExtra = 0;                

     wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;

     if (!RegisterClassEx (&wincl))
         return 0;

     hwnd = CreateWindowEx (
            0,
            szClassName,
            "Windows App",
            WS_OVERLAPPEDWINDOW,
            CW_USEDEFAULT,
            CW_USEDEFAULT,
            544,
            375,  
            HWND_DESKTOP,  
            NULL,    
            hThisInstance,   
            NULL
            );

     ShowWindow (hwnd, nFunsterStil);

     while (GetMessage (&messages, NULL, 0, 0))
     {
         TranslateMessage(&messages);
         DispatchMessage(&messages);
     }
     return messages.wParam;
}

LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
     switch (message)
     {
         case WM_DESTROY:
             PostQuitMessage (0);
             break;
         default:
             return DefWindowProc (hwnd, message, wParam, lParam);
     }

     return 0;
}