anyone has a problem???

I have a problem, and it's called "Bush." I doubt you can do anything about him, though.

Does it really matter whether you use i or j? Either way, it's an imaginary number, so you're just designating some letter to take its place. It's not like j or i have a different value or anything (although I must admit, i's are written much faster). I personally used i, but I don't see why it should be any different from variables.