#include <windows.h>

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp) {
if (msg == WM_DESTROY) {
PostQuitMessage(0);
} else if (msg == WM_PAINT) {
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hwnd, &ps);
TextOut(hdc, 50, 50, "Hello World!", 12);
EndPaint(hwnd, &ps);
} else {
return DefWindowProc(hwnd, msg, wp, lp);
}
return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {
WNDCLASS wc = {0};
wc.lpfnWndProc = WndProc;
wc.hInstance = hInstance;
wc.lpszClassName = "HelloWorldClass";

RegisterClass(&wc);

HWND hwnd = CreateWindow("HelloWorldClass", "Hello World", WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, 300, 200,
NULL, NULL, hInstance, NULL);

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

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