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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.