C++ is usually my choice language. If I'm writing a reusable API or low level tool it's going to be in C++. I'm not a heavy STL or template user; though I do use many parts of SDL when I find it most useful. When I originally learned C++ it was ANSI C++ many years ago so my code my not often utilize the latest and greatest, but every once in awhile I give in to my old ways and use something new. That means that sometimes my code is only going to be compatible with C++11, but most of the time it's not. I'm a simplistic person and I prefer readability, especially when posting here.
C is another language I enjoy. I especially like to use it when making the most basic of command-line tools or teaching others how to do something. It's often easier to see what's going on in C than in C++ and that's just my opinion.