Off the top of my head, C99 features that I've used in the past couple months: - declarations mixed with statements - declarations in `for` constructs -

Off the top of my head, C99 features that I've used in the past couple months: - declarations mixed with statements - declarations in `for` constructs - hexadecimal floating-point literals and conversion specifiers - the strtoxx( ) conversion routines - the restrict qualifier - the expanded math library - designated initializers - extended integer types - compound literals - // comments - VLAs - complex support Note that some of these features are still not present in C++11. C11 features that I have used in the past few months: - CMPLX macros - anonymous structures and unions - <stdalign.h>