Error in DirectX Code...

[yge3d]

So... i was following this, tutorial. i made everything as it showed me. gives me an weird error.. heres my code:

// include the basic windows header files and the Direct3D header file #include <windows.h> #include <windowsx.h> #include <d3d9.h>
#include <Windows.h>
#include <windowsx.h>
#include <d3d9.h>

//include the Direct3D Library file
#pragma comment (lib, "d3d9.lib")

//global declarations
LPDIRECT3D9 d3d; // the pointer to our Direct3D Interface
LPDIRECT3DDEVICE9 d3ddev; // the pointer to the device class

//function prototypes
void initD3D(HWND hWnd); // set up and initializes Direct3D
void render_frame(void); // renders a single frame
void cleanD3D(void); // closes Direct3D and releases memory

//the WindowProc function prototype
LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);

//this function initializes and prepares Direct3D for use
void initD3D(HWND hWnd)
{
	d3d = Direct3DCreate9(D3D_SDK_VERSION); // create the Direct3D interface

	D3DPRESENT_PARAMETERS d3dpp; // create a struct to hold various device information

	ZeroMemory(&d3dpp, sizeof(d3dpp)); // clear out the struct for use
	d3dpp.Windowed = TRUE; // program windowed, not fullscreen
	d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD; // discard old frames
	d3dpp.hDeviceWindow = hWnd; // set the window to be used by Direct3D

	//create a device class using this information and information from the d3dpp struct
	d3d->CreateDevice(D3DADAPTER_DEFAULT,
						D3DDEVTYPE_HAL,
						hWnd,
						D3DCREATE_SOFTWARE_VERTEXPROCESSING,
						&d3dpp,
						&d3ddev);
}

HRESULT CreateDevice( UINT Adapter, D3DDEVTYPE DeviceType, HWND hFocusWindow, DWORD BehaviorFlags, D3DPRESENT_PARAMETERS *pPresentationParameters, IDirect3DDevice9 **ppReturnedDeviceInterface);

void render_frame(void)
{
	//clear the window to a deep blue
	d3ddev->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0, 40, 100), 1.0f, 0);

	d3ddev->BeginScene(); // begins the 3D scene

	// do 3D rendering on the back buffer here

	d3ddev->EndScene(); // ends the 3D scene

	d3ddev->Present(NULL, NULL, NULL, NULL); // displays the created frame
}

// this is the function that cleans up Direct3D and COM
void cleanD3D(void)
{
	d3ddev->Release(); // close and release the 3D device
	d3d->Release(); // close and release Direct3D
}

and i get 2 errors: error LNK2019: unresolved external symbol _WinMain@16 referenced in function ___tmainCRTStartup
error: error LNK1120: 1 unresolved externals

Any help?