Standard Predefined Macros

The standard predefined macros are specified by the C and/or C++ language standards, so they are available with all compilers that implement those standards. Older compilers may not provide all of them. Their names all start with double underscores.

• __FILE__
• __LINE__
• __DATE__
• __TIME__
• __STDC__
• __STDC_VERSION__
• __STDC_HOSTED__