One of the persistent myths about Object Oriented programming is that you need to use a special language to program in an object oriented fashion.
The truth is that you can write OO code in any language, and you can write non-OO code even in languages like C++ or Ruby that are very focused on OO.
In your example, though, the answer is no: your code is strictly procedural code.
That doesn't mean you can't write OO code in C, just that you haven't this time.
Consider http://en.wikipedia.org/wiki/Object-oriented_analysis_and_design for some of the background theory, and consider that the original C++ compilers were just a front-end to a C compiler.