reserved C macro

gcc 3.4.5 (mingw), Windows XP

#include <stdio.h>

/*
   reserved C marco
   __FILE__, __LINE__, __DATE__, __TIME__
 */

int main()
{
    printf("file name :\t%s\n", __FILE__);
    printf("line number :\t%d\n", __LINE__);
    printf("date :\t%s\n", __DATE__);
    printf("time :\t%s\n", __TIME__);

    return 0;
}