[cypher543]

Unless you're working on ancient software or writing an OO programming language that translates to C, you really shouldn't need to worry about OOP in C. I suggest learning as much as you can about C and then graduate to C++. Java would be fine, too (as would C# or Python or whatever), but I personally like writing C++ whenever I can. It's a nice blend of low-level system programming and high-level abstractions. C++11 is even better with standard threads, clocks, promises, futures, anonymous functions, and so on.