   Some questions about programming
  Hello !I'm very new to DirectX and I have a lot of questions ...I. cannot understand why we use foloat for pointing Pixel on screen(for example CUSTOMVERTEX (D3DFVF_XYZ))II.Is it good to begin game programming with DirectX 9 ?   
  I. You're not specifying a pixel on screen, you're specifying a coordinate in 3D space.II. Definitely not. You need a good grasp of C++, and a reasonable understanding of Win32 before even attempting DirectX stuff, otherwise you'll just keep running into problems.   ;  10x a lot for your answer   