What are the standard predefined macros?

The ANSI C standard defines six predefined macros for use in the C language: Macro Name Purpose _ _LINE_ _ Inserts the current source code line number in your code. _ _FILE_ _ Inserts the current source code filename in your code. _ _DATE_ _ Inserts the current date of compilation in your code. _ _TIME_ _ Inserts the current time of compilation in your code. _ _STDC_ _ Is set to 1 if you are enforcing strict ANSI C conformity. _ _cplusplus Is defined if you are compiling a C++ program.