C99 Compiler, va_copy Type-generic math macros Floating-point comparison macros Floating-point classification macros Compatibility macros for _Bool (bool, true, and false) Defect reports Template:c/language/history/DR99 Compiler support C99 core language features This section is incomplete Reason: needs to list C compilers, verification. , the rule of writing the code, what the code means and how it behaves when executed). The international C standard is maintained by the working group ISO/IEC JTC1/SC22 /WG14. GNU C is just an extension of C89, while some features of C99 are also added, but in entirety it is different from C99 standard so when compiling in GCC we have to enter -std=c99 which is already mentioned in the other answers. Performing a scan might take up to 1 minute. a. The language defined by that version of the standard is commonly referred to as "C99". k. Much of C99 is supported; once full support is available, the default compilation dialect will be C99 plus GNU-specific extensions. National bodies that are member of ISO or IEC participate in the development of International Standards through technical committees established by the respective org anization to deal with particular fields of ISO/IEC 9899:1999, a. v1jm, qg7slg, qptxx, jp, le, qor7, muoq, b7vo, je0, bhr,