#include <Windows.h>
#include <math.h>

LRESULT CALLBACK HelloWorldWndProc( HWND, UINT, UINT, LONG );
char text[30];
int x,y;
int count;

int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance,
	LPSTR  lpszCmdParam, int nCmdShow )
{
	HWND hWnd;
	WNDCLASS WndClass;
	MSG Msg;
	char szClassName[] = "Hello World";
	WndClass.style = CS_HREDRAW | CS_VREDRAW;
	WndClass.lpfnWndProc = HelloWorldWndProc;
	WndClass.cbClsExtra = 0;
	WndClass.cbWndExtra = 0;
	WndClass.hInstance = hInstance;
	WndClass.hIcon = LoadIcon( NULL, IDI_APPLICATION );
	WndClass.hCursor = LoadCursor( NULL, IDC_ARROW );
	WndClass.hbrBackground = ( HBRUSH )GetStockObject( WHITE_BRUSH );
	WndClass.lpszMenuName = NULL;
	WndClass.lpszClassName = szClassName;

	if( !RegisterClass( &WndClass ) )
	{
		MessageBox( NULL, "Cannot register class", "Error", MB_OK );
		return 0;
	}

	hWnd = CreateWindow( szClassName,
		"Program No 1",
		WS_OVERLAPPEDWINDOW,
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		NULL,
		NULL,
		hInstance,
		NULL );

	if( !hWnd )
	{
		MessageBox( NULL, "Cannot create window", "Error", MB_OK );
		return 0;
	}

	ShowWindow( hWnd, nCmdShow );
	UpdateWindow( hWnd );

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

LRESULT CALLBACK HelloWorldWndProc( HWND hWnd, UINT Message,
	UINT wParam, LONG lParam )
{
	HDC hDC;
	PAINTSTRUCT PaintStruct;
	RECT Rect;
	HPEN pen = CreatePen(PS_SOLID, 0, RGB(255,0,0));
	switch( Message )
	{
	case WM_PAINT :
		hDC = BeginPaint( hWnd, &PaintStruct );
		GetClientRect( hWnd, &Rect );
		SelectObject(hDC, pen);
		if(text[0] == 'Y'){
			TextOut(hDC, y, x, text, count);
		}
		EndPaint( hWnd, &PaintStruct );
		return 0;
	case WM_LBUTTONDOWN :
		count = wsprintf(text,"Y:%d, X:%d",LOWORD(lParam),HIWORD(lParam));
		y = LOWORD(lParam);
		x = HIWORD(lParam);
		InvalidateRect(hWnd, &Rect, true);
		return 0;
	case WM_DESTROY :
		PostQuitMessage( 0 );
		return 0;
	}

	return DefWindowProc( hWnd, Message, wParam, lParam );
}