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Groups > comp.lang.c > #124035
| From | Keith Thompson <kst-u@mib.org> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: NULL as the empty string |
| Date | 2017-12-08 17:39 -0800 |
| Organization | None to speak of |
| Message-ID | <lnh8t0smrg.fsf@kst-u.example.com> (permalink) |
| References | (6 earlier) <p0f1eb$sg1$1@dont-email.me> <lnvahgst7s.fsf@kst-u.example.com> <p0f7ki$6t5$1@dont-email.me> <lnr2s4sr4c.fsf@kst-u.example.com> <p0faco$mh8$1@dont-email.me> |
jacobnavia <jacob@jacob.remcomp.fr> writes:
> Le 09/12/2017 à 01:05, Keith Thompson a écrit :
>> A*string* is a contiguous sequence of characters terminated by and
>> including the first null character.
>
> A string is a contiguous sequence of characters terminated by and
> including the first null character.
>
> A *pointer to a string* is a pointer to its initial (lowest
> addressed) character or NULL, meaning the empty string.
>
> NULL has a pointer type but it doesn't point to anything, so it is
> used to represent the empty string.
The NULL macro, when evaluated as an expression, does not necessarily
have pointer type. It could have integer type.
> With these definitions we can establish truth tables for each of the
> string functions in a similar way that math functions have defined
> behaviors for NANs and infs
Let me ask you again, *please* stop saying "NULL" when you mean "a null
pointer value". They're two different things. Every occurrence (I
think) of NULL that you've used in this discussion would more accurately
be written as "a null pointer". The macro NULL defined in <stddef.h>
and several other headers is not relevant.
Your use of "NULL" has already caused at least one person to
misunderstand what you're talking about.
--
Keith Thompson (The_Other_Keith) kst-u@mib.org <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"
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NULL as the empty string jacobnavia <jacob@jacob.remcomp.fr> - 2017-11-21 23:52 +0100
Re: NULL as the empty string Keith Thompson <kst-u@mib.org> - 2017-11-21 15:16 -0800
Re: NULL as the empty string jacobnavia <jacob@jacob.remcomp.fr> - 2017-11-22 00:38 +0100
Re: NULL as the empty string Keith Thompson <kst-u@mib.org> - 2017-11-21 16:02 -0800
Re: NULL as the empty string jacobnavia <jacob@jacob.remcomp.fr> - 2017-11-22 01:13 +0100
Re: NULL as the empty string Keith Thompson <kst-u@mib.org> - 2017-11-21 16:52 -0800
Re: NULL as the empty string Robert Wessel <robertwessel2@yahoo.com> - 2017-11-21 18:09 -0600
Re: NULL as the empty string Siri Cruise <chine.bleu@yahoo.com> - 2017-11-21 16:34 -0800
Re: NULL as the empty string David Brown <david.brown@hesbynett.no> - 2017-11-22 12:12 +0100
Re: NULL as the empty string supercat@casperkitty.com - 2017-11-21 15:57 -0800
Re: NULL as the empty string jacobnavia <jacob@jacob.remcomp.fr> - 2017-11-22 01:06 +0100
Re: NULL as the empty string supercat@casperkitty.com - 2017-11-22 15:42 -0800
Re: NULL as the empty string Melzzzzz <Melzzzzz@zzzzz.com> - 2017-11-22 23:49 +0000
Re: NULL as the empty string supercat@casperkitty.com - 2017-11-22 15:56 -0800
Re: NULL as the empty string Melzzzzz <Melzzzzz@zzzzz.com> - 2017-11-23 00:06 +0000
Re: NULL as the empty string supercat@casperkitty.com - 2017-11-23 17:31 -0800
Re: NULL as the empty string jacobnavia <jacob@jacob.remcomp.fr> - 2017-11-24 09:42 +0100
Re: NULL as the empty string supercat@casperkitty.com - 2017-11-24 13:47 -0800
Re: NULL as the empty string Jorgen Grahn <grahn+nntp@snipabacken.se> - 2017-11-22 06:46 +0000
Re: NULL as the empty string John Bode <jfbode1029@gmail.com> - 2017-12-08 10:27 -0800
Re: NULL as the empty string Keith Thompson <kst-u@mib.org> - 2017-12-08 11:11 -0800
Re: NULL as the empty string jacobnavia <jacob@jacob.remcomp.fr> - 2017-12-08 21:39 +0100
Re: NULL as the empty string Keith Thompson <kst-u@mib.org> - 2017-12-08 13:03 -0800
Re: NULL as the empty string jacobnavia <jacob@jacob.remcomp.fr> - 2017-12-08 22:50 +0100
Re: NULL as the empty string Keith Thompson <kst-u@mib.org> - 2017-12-08 15:19 -0800
Re: NULL as the empty string jacobnavia <jacob@jacob.remcomp.fr> - 2017-12-09 00:35 +0100
Re: NULL as the empty string Keith Thompson <kst-u@mib.org> - 2017-12-08 16:05 -0800
Re: NULL as the empty string jacobnavia <jacob@jacob.remcomp.fr> - 2017-12-09 01:22 +0100
Re: NULL as the empty string Keith Thompson <kst-u@mib.org> - 2017-12-08 17:39 -0800
Re: NULL as the empty string John Bode <jfbode1029@gmail.com> - 2017-12-11 12:22 -0800
Re: NULL as the empty string jacobnavia <jacob@jacob.remcomp.fr> - 2017-12-09 01:29 +0100
Re: NULL as the empty string Keith Thompson <kst-u@mib.org> - 2017-12-08 17:47 -0800
Re: NULL as the empty string jacobnavia <jacob@jacob.remcomp.fr> - 2017-12-09 07:05 +0100
Re: NULL as the empty string David Brown <david.brown@hesbynett.no> - 2017-12-09 18:37 +0100
Re: NULL as the empty string Keith Thompson <kst-u@mib.org> - 2017-12-09 11:53 -0800
Re: NULL as the empty string supercat@casperkitty.com - 2017-12-12 10:49 -0800
Re: NULL as the empty string Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-12-12 13:39 -0800
Re: NULL as the empty string supercat@casperkitty.com - 2017-12-12 16:05 -0800
Re: NULL as the empty string Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-12-13 03:43 -0800
Re: NULL as the empty string supercat@casperkitty.com - 2017-12-13 08:45 -0800
Re: NULL as the empty string Keith Thompson <kst-u@mib.org> - 2017-12-13 09:12 -0800
Re: NULL as the empty string Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-12-13 13:27 -0800
Re: NULL as the empty string Keith Thompson <kst-u@mib.org> - 2017-12-13 14:02 -0800
Re: NULL as the empty string asetofsymbols@gmail.com - 2017-12-13 14:58 -0800
Re: NULL as the empty string asetofsymbols@gmail.com - 2017-12-13 15:11 -0800
Re: NULL as the empty string Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-12-14 03:49 -0800
Re: NULL as the empty string mark.bluemel@gmail.com - 2017-12-14 04:05 -0800
Re: NULL as the empty string David Brown <david.brown@hesbynett.no> - 2017-12-14 13:09 +0100
Re: NULL as the empty string Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-12-14 05:02 -0800
Re: NULL as the empty string David Brown <david.brown@hesbynett.no> - 2017-12-14 14:54 +0100
Re: NULL as the empty string supercat@casperkitty.com - 2017-12-14 07:38 -0800
Re: NULL as the empty string Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-12-14 09:50 -0800
Re: NULL as the empty string Keith Thompson <kst-u@mib.org> - 2017-12-14 09:20 -0800
Re: NULL as the empty string supercat@casperkitty.com - 2017-12-14 09:53 -0800
Re: NULL as the empty string Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-12-14 12:57 -0800
Re: NULL as the empty string herrmannsfeldt@gmail.com - 2017-12-14 17:22 -0800
Re: NULL as the empty string Keith Thompson <kst-u@mib.org> - 2017-12-14 17:26 -0800
Re: NULL as the empty string jacobnavia <jacob@jacob.remcomp.fr> - 2017-12-08 21:23 +0100
Re: NULL as the empty string Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-12-08 13:41 -0800
Re: NULL as the empty string jacobnavia <jacob@jacob.remcomp.fr> - 2017-12-08 22:54 +0100
Re: NULL as the empty string supercat@casperkitty.com - 2017-11-21 15:17 -0800
Re: NULL as the empty string jacobnavia <jacob@jacob.remcomp.fr> - 2017-11-22 00:26 +0100
Re: NULL as the empty string supercat@casperkitty.com - 2017-11-21 16:03 -0800
Re: NULL as the empty string "Pascal J. Bourguignon" <pjb@informatimago.com> - 2017-11-22 00:27 +0100
Re: NULL as the empty string jacobnavia <jacob@jacob.remcomp.fr> - 2017-11-22 00:42 +0100
Re: NULL as the empty string Keith Thompson <kst-u@mib.org> - 2017-11-21 16:05 -0800
Re: NULL as the empty string herrmannsfeldt@gmail.com - 2017-12-06 22:33 -0800
Re: NULL as the empty string supercat@casperkitty.com - 2017-12-07 12:04 -0800
Re: NULL as the empty string jacobnavia <jacob@jacob.remcomp.fr> - 2017-12-07 23:20 +0100
Re: NULL as the empty string supercat@casperkitty.com - 2017-12-07 15:04 -0800
Re: NULL as the empty string Keith Thompson <kst-u@mib.org> - 2017-11-21 15:28 -0800
Re: NULL as the empty string Thiago Adams <thiago.adams@gmail.com> - 2017-11-21 16:04 -0800
Re: NULL as the empty string Siri Cruise <chine.bleu@yahoo.com> - 2017-11-21 16:25 -0800
Re: NULL as the empty string jacobnavia <jacob@jacob.remcomp.fr> - 2017-11-22 01:34 +0100
Re: NULL as the empty string bartc <bc@freeuk.com> - 2017-11-22 00:36 +0000
Re: NULL as the empty string Öö Tiib <ootiib@hot.ee> - 2017-11-21 23:07 -0800
NULL as the empty string asetofsymbols@gmail.com - 2017-11-23 22:23 -0800
Re: NULL as the empty string Geoff <geoff@invalid.invalid> - 2017-12-09 09:05 -0800
Re: NULL as the empty string Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2017-12-09 12:40 -0500
Re: NULL as the empty string gordonb.yj0bc@burditt.org (Gordon Burditt) - 2017-12-09 13:50 -0600
Re: NULL as the empty string Ian Collins <ian-news@hotmail.com> - 2017-12-10 08:59 +1300
Re: NULL as the empty string Keith Thompson <kst-u@mib.org> - 2017-12-09 12:22 -0800
Re: NULL as the empty string jacobnavia <jacob@jacob.remcomp.fr> - 2017-12-11 01:42 +0100
Re: NULL as the empty string Keith Thompson <kst-u@mib.org> - 2017-12-10 19:20 -0800
Re: NULL as the empty string jacobnavia <jacob@jacob.remcomp.fr> - 2017-12-11 18:56 +0100
Re: NULL as the empty string Keith Thompson <kst-u@mib.org> - 2017-12-11 11:19 -0800
Re: NULL as the empty string supercat@casperkitty.com - 2017-12-15 09:29 -0800
Re: NULL as the empty string Thiago Adams <thiago.adams@gmail.com> - 2018-01-05 08:28 -0800
Re: NULL as the empty string supercat@casperkitty.com - 2018-01-05 09:37 -0800
Re: NULL as the empty string Thiago Adams <thiago.adams@gmail.com> - 2018-01-05 17:08 -0800
Re: NULL as the empty string supercat@casperkitty.com - 2017-12-15 09:18 -0800
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