C tutorial

I'm working on the C tutorial on cocoadevcentral.com.  Its pretty helpful to explain the basics of C.  I already know most of it but he doesn't hurt to really make sure I understand it all clearly.  It's also useful to go through the little programs it has and make them to see how they run.  I can also play around with them and see what changes when I edit the files.  Right now I'm learning about structs, which are like variable types that you create and can define what the variables in them will be.  They seem kind of like a combination of a function and an array, but they are something new and not in PHP.  After I'm done with this tutorial I'll go through the second Cocoa tutorial on the site because these seem pretty helpful.