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.

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