A.12.10 Predefined names
Several identifiers are predefined, and expand to produce special information. They, and also the preprocessor expansion operator defined, may not be undefined or redefined.
LINE A decimal constant containing the current source line number. FILE A string literal containing the name of the file being compiled. DATE A string literal containing the date of compilation, in the form "Mmmm dd yyyy" TIME A string literal containing the time of compilation, in the form "hh:mm:ss" STDC The constant 1. It is intended that this identifier be defined to be 1 only in standard-conforming implementations.
- #error and #pragma are new with the ANSI standard; the predefined preprocessor macros are new, but some of them have been available in some implementations.