C's predefined macros--tutorial.jcwcn.com

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

Content:

__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 
}

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C's predefined macros

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