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Geekpedia » C Tutorials » C's predefined macros

C's predefined macros

A list of C's predefined macros (__FILE__, __LINE__, __STDC__...) with description and an example of how to use them.

On Sunday, March 21st 2004 at 10:43 AM

By Andrew Pociu (View Profile)

(Rated 3.1 with 11 votes)

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__FILE__ - a string that holds the path/name of the compiled file;
__LINE__ - an integer that holds the number of the current line number;
__DATE__ - a string that holds the current system date;
__TIME__ - a string that holds the current system time;
__STDC__ - defined as the value '1' if the compiler conforms with the ANSI C standard;
__cplusplus - determines if your compiler is in C or C++ mode. Usually used in headers.




#include <stdio.h>



void main(void)

{

    printf("The path/name of this file is %s\n", __FILE__);

    printf("The current line is %d\n", __LINE__);

    printf("The current system date is %s\n", __DATE__);

    printf("The current system time is %s\n", __TIME__);

    #ifdef __STDC__

        printf("The compiler conforms with the ANSI C standard\n");

    #else

        printf("The compiler doesn't conform with the ANSI C standard\n");

    #endif

    #ifdef __cplusplus

        printf("The compiler is working with C++\n");

    #else

        printf("The compiler is working with C\n");

    #endif

}