In keeping with what eBusiness said, the first time you use a float, the first time it appears, you define it with #, then it follows that you might want to follow an old practice of defining all your variable up front, with their various float/string/whatever appelations, and then it's all taken care of, without having to deal with it later. The reason I suggest this, is that I tend to NOT do that (i.e. I make up variables as I go along), and from time to time, I create a variable and then am told by the compiler that I am not allowed to use my variable that way, 'cause I already defined the variable a different kind earlier. Example, defined xpos# as float, then try to use xpos as an integer later, and get ears pinned back by compiler, You can't do that!