- Prison Code Breaker Diary -

There're some pre-defined macros in C, and we can make use of them to save programming code.

__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>>

int
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

  return 0; 
}

It's self-explained source ^^!

Have fun!@