How to Start Windows Programming with MinGW

#include <stdio.h>
int main()
{
  printf("Hello, world\n");
  return 0;
}

#include <windows.h>

int WinMain(HINSTANCE,HINSTANCE,LPSTR,int)
{
  MessageBox(0,"Hello, Windows","MinGW Test Program",MB_OK);
  return 0;
}

#include <windows.h>

char *AppTitle="Win1";
LRESULT CALLBACK WindowProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam);

int WinMain(HINSTANCE hInst,HINSTANCE,LPSTR,int nCmdShow)
{
  WNDCLASS wc;
  HWND hwnd;
  MSG msg;

  wc.style=CS_HREDRAW | CS_VREDRAW;
  wc.lpfnWndProc=WindowProc;
  wc.cbClsExtra=0;
  wc.cbWndExtra=0;
  wc.hInstance=hInst;
  wc.hIcon=LoadIcon(NULL,IDI_WINLOGO);
  wc.hCursor=LoadCursor(NULL,IDC_ARROW);
  wc.hbrBackground=(HBRUSH)COLOR_WINDOWFRAME;
  wc.lpszMenuName=NULL;
  wc.lpszClassName=AppTitle;

  if (!RegisterClass(&wc))
    return 0;

  hwnd = CreateWindow(AppTitle,AppTitle,
    WS_OVERLAPPEDWINDOW,
    CW_USEDEFAULT,CW_USEDEFAULT,100,100,
    NULL,NULL,hInst,NULL);

  if (!hwnd)
    return 0;

  ShowWindow(hwnd,nCmdShow);
  UpdateWindow(hwnd);

  while (GetMessage(&msg,NULL,0,0) > 0)
  {
    TranslateMessage(&msg);
    DispatchMessage(&msg);
  }
}

LRESULT CALLBACK WindowProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
{
  switch (msg)
  {
    case WM_PAINT:
    {
      PAINTSTRUCT ps;
      HDC dc;
      RECT r;
      GetClientRect(hwnd,&r);
      dc=BeginPaint(hwnd,&ps);
      DrawText(dc,"Hello World",-1,&r,DT_SINGLELINE|DT_CENTER|DT_VCENTER);
      EndPaint(hwnd,&ps);
      break;
    }

    case WM_DESTROY:
      PostQuitMessage(0);
      break;

    default:
      return DefWindowProc(hwnd, msg, wparam, lparam);
  }
  return 0;
}