ISO_C/NULL_DEF

FILE: stddef.h
////////////////////////////////////////////////////////////////

/* A null pointer constant.  */

#if defined (_STDDEF_H) || defined (__need_NULL)
    #undef NULL     /* in case <stdio.h> has defined it. */

    #ifdef __GNUG__
        #define NULL __null
    #else   /* G++ */
        #ifndef __cplusplus
            #define NULL ((void *)0) //:<<<NOT C++, But Plain C <<<<<<<<<<<<<<<< NOTICE_ME_SENPAI !!!!!!!!!!!!
        #else   /* C++ */
            #define NULL 0
        #endif  /* C++ */
    #endif  /* G++ */
#endif  /* NULL not defined and <stddef.h> or need NULL.  */
#undef  __need_NULL

////////////////////////////////////////////////////////////////