In addition to __LINE__ and __FILE__ (see “Line
Control (#line)”), ANSI C provides the __DATE__, __TIME__ and __STDC__ predefined macros. Table 7-1 “Predefined Macros ” describes the complete set of macros that are predefined
to produce special information. They may not be undefined.
Table 7-1 Predefined Macros
Macro Name | Description |
|---|
__DATE__ | Produces the date of compilation in the
form Mmm dd yyyy. |
__FILE__ | Produces the name of the file being compiled. |
__LINE__ | Produces the current source line number. |
__STDC__ | Produces the decimal constant 1, indicating
that the implementation is standard-conforming. |
__TIME__ | Produces the time of compilation in the
form hh:mm:ss. |
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 | NOTE: __DATE__, __TIME__, and __STDC__ are only defined in ANSI mode. |
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