Hello, I’m Pat Brenner, a developer on the Visual C++ Libraries team. In this blog post I want to share some information about the C99 support added to the C run-time library in Visual Studio 2013. To summarize, we added declarations and implementations for missing functions in the following headers: math.h, ctype.h, wctype.h, stdio.h, stdlib.h, and wchar.h. We also added the new headers complex.h