When you program in C, you create what are called "header" files. They contain all the class definitions for the methods used. You generally split the class definition and the class implementation parts of the class. Its just how it works. You can have the class implementation in the class definition file but it gets annoying to have to scroll past all the definitions.
Sorry I've been absent lately, I've been working on an FPGA and I've slowly been realizing how much more awesome it is.