Programming Classes

    
#include <stdio.h>

int main(void) {
  printf("Hello");
  return 0;
}
[/SOURCE]

Basic Windows program in C/C++:
[SOURCE]
#include <windows.h>

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

char szWinName[] = "MyWin";
HINSTANCE hInst;

int WINAPI WinMain(HINSTANCE hThisInst, HINSTANCE hPrevInst,
                   LPSTR lpszArgs, int nWinMode)
{
  HWND hwnd;
  MSG msg;
  WNDCLASSEX wcl;
  /* Define a window class. */
  wcl.hInstance = hThisInst; /* handle to this instance */
  wcl.lpszClassName = szWinName; /* window class name */
  wcl.lpfnWndProc = WindowFunc; /* window function */
  wcl.style = 0; /* default style */

  wcl.cbSize = sizeof(WNDCLASSEX); /* set size of WNDCLASSES */

  wcl.hIcon = LoadIcon(hThisInst, MAKEINTRESOURCE(MY_ICON)); /* large icon */
  wcl.hIconSm = LoadIcon(hThisInst, MAKEINTRESOURCE(MY_ICON)); /* small icon */

  wcl.hCursor = LoadCursor(NULL, IDC_ARROW); /* cursor style */
  wcl.lpszMenuName = NULL; /* no menu */

  wcl.cbClsExtra = 0; /* no extra */
  wcl.cbWndExtra = 0; /* information needed */

  /* Make the window background light gray. */
  wcl.hbrBackground = (HBRUSH) GetStockObject(LTGRAY_BRUSH);

  /* Register the window class. */
  if(!RegisterClassEx(&wcl)) return 0;

  hwnd = CreateWindow(szWinName, "Messenger",
    (WS_SYSMENU | WS_MINIMIZEBOX | WS_OVERLAPPED),
    CW_USEDEFAULT, CW_USEDEFAULT,
    600, 325, HWND_DESKTOP, NULL, hThisInst, NULL);

  hInst = hThisInst;
  ShowWindow(hwnd, nWinMode);
  UpdateWindow(hwnd);

  while(GetMessage(&msg, NULL, 0, 0))
  {
    TranslateMessage(&msg);
    DispatchMessage(&msg);
  }
  return msg.wParam;
}
LRESULT CALLBACK WindowFunc(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;
}