ANSI C defines a number of macros. Although each one is available for your use in programming, the predefined macros should not be directly modified.
- DATE The current date as a character literal in "MMM DD YYYY" format
- TIME The current time as a character literal in "HH:MM:SS" format
- FILE This contains the current filename as a string literal.
- LINE This contains the current line number as a decimal constant.
- STDC Defined as 1 when the compiler complies with the ANSI standard.