Re: longer 'char literals' meaning in c

From	Keith Thompson <Keith.S.Thompson+u@gmail.com>
Newsgroups	comp.lang.c
Subject	Re: longer 'char literals' meaning in c
Date	2020-04-30 17:15 -0700
Organization	None to speak of
Message-ID	<87tv104ij2.fsf@nosuchdomain.example.com> (permalink)
References	(3 earlier) <DZzqG.217998$dx4.55655@fx05.am4> <87sggk665l.fsf@nosuchdomain.example.com> <znHqG.187261$vn2.19120@fx34.am4> <874kt061yl.fsf@nosuchdomain.example.com> <oNIqG.282039$QJp.69102@fx08.am4>

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Bart <bc@freeuk.com> writes:
> On 30/04/2020 23:30, Keith Thompson wrote:
[...]
>> There is no specified limit on the number of characters in a
>> multi-character constant.
>
> I don't agree with that. If the extra characters can't be used and
> shouldn't be there, then that's an error in my book. DMC agrees, and
> further it explicitly states a maximum of 4 characters.

What exactly do you disagree with?

The C standard does not impose a limit on the number of characters in a
multi-character constant.  If you disagree with that, cite the wording
in the standard that imposes such a limit.  If you merely think that
it *should* be an error, please make it clearer that you're stating your
personal opinion rather than discussing what the standard says.

DMC is the Digital Mars C compiler, yes?  What exactly does it do
with a character constant such as 'ABCDE'?  If DMC does not attempt
to be fully conforming by default, feel free to say what it does
by default and what it does in conforming mode.

If it rejects
    int n = 'ABCDE';
in a mode in which it claims to conform to the standard, that would be a
bug.  (A non-fatal warning would not violate the standard.)

> But then gcc takes the same approach to obviously over-long integer
> constants, and we're back into this same situation of needing to run
> gcc with specially refined collections of options just to get it to do
> the obvious thing.

gcc is not fully conforming by default, and I'm not interested
in getting into that discussion again.  The C standard specifies
the type and value of any integer constant, and says that that
an integer constant whose value is outside the range of its type
violates a constraint.  I'm not aware of anything gcc does in
this area that is non-conforming (or anything that I object to).
What approach are you talking about?

> My compiler, for all its other problems, will at least report
> over-long char and integer constants as proper errors. So a program
> with those faults cannot be compiled unless they are fixed.

Are you referring to your C compiler?

You are not required to make your compiler conform to the C standard,
and you apparently have chosen not to do so.

-- 
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
Working, but not speaking, for Philips Healthcare
void Void(void) { Void(); } /* The recursive call of the void */

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longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 04:43 -0700
  Re: longer 'char literals' meaning in c Bonita Montero <Bonita.Montero@gmail.com> - 2020-04-30 13:55 +0200
    Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 05:17 -0700
      Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 05:22 -0700
        Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 05:24 -0700
          Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 05:29 -0700
            Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 06:16 -0700
        Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 05:44 -0700
      Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-04-30 14:00 +0100
        Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 06:13 -0700
          Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-04-30 14:41 +0100
            Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 07:18 -0700
              Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 07:31 -0700
                Re: longer 'char literals' meaning in c Spiros Bousbouras <spibou@gmail.com> - 2020-04-30 15:49 +0000
                Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 09:12 -0700
              Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-04-30 15:49 +0100
                Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 08:31 -0700
        Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-04-30 14:00 -0700
          Re: longer 'char literals' meaning in c Spiros Bousbouras <spibou@gmail.com> - 2020-04-30 21:16 +0000
            Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-04-30 15:22 -0700
            Re: longer 'char literals' meaning in c James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-04-30 18:36 -0400
          Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-04-30 22:25 +0100
            Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-04-30 15:30 -0700
              Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-05-01 00:01 +0100
                Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 16:15 -0700
                Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 16:29 -0700
                Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-04-30 17:15 -0700
                Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-05-01 01:47 +0100
                Re: longer 'char literals' meaning in c James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-04-30 18:38 -0700
                Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-04-30 18:55 -0700
                Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-05-01 11:35 +0100
                Re: longer 'char literals' meaning in c James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-05-01 05:47 -0700
                Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-05-01 06:15 -0700
                Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-05-01 15:53 +0100
                Re: longer 'char literals' meaning in c Richard Damon <Richard@Damon-Family.org> - 2020-05-01 12:38 -0400
                Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-05-01 09:57 -0700
                Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-05-01 20:50 +0100
                Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-05-01 13:11 -0700
                Re: longer 'char literals' meaning in c jameskuyper@stellarscience.com - 2020-05-01 12:05 -0700
                Re: longer 'char literals' meaning in c James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-05-01 19:08 -0400
                Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-05-01 09:51 -0700
                Re: longer 'char literals' meaning in c David Brown <david.brown@hesbynett.no> - 2020-05-02 15:22 +0200
                Re: longer 'char literals' meaning in c Richard Damon <Richard@Damon-Family.org> - 2020-05-02 12:13 -0400
                Re: longer 'char literals' meaning in c Les Cargill <lcargill99@comcast.com> - 2020-05-04 00:17 -0500
                Re: longer 'char literals' meaning in c James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-05-04 10:51 -0400
                Re: longer 'char literals' meaning in c James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-05-04 10:23 -0400
                Re: longer 'char literals' meaning in c David Brown <david.brown@hesbynett.no> - 2020-05-04 16:48 +0200
                Re: longer 'char literals' meaning in c James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-05-04 12:39 -0400
                Re: longer 'char literals' meaning in c David Brown <david.brown@hesbynett.no> - 2020-05-04 19:37 +0200
                Re: longer 'char literals' meaning in c James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-05-04 15:03 -0400
                Re: longer 'char literals' meaning in c David Brown <david.brown@hesbynett.no> - 2020-05-05 08:33 +0200
                Re: longer 'char literals' meaning in c James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-05-05 09:47 -0400
                Re: longer 'char literals' meaning in c David Brown <david.brown@hesbynett.no> - 2020-05-05 16:22 +0200
                Re: longer 'char literals' meaning in c Tim Rentsch <tr.17687@z991.linuxsc.com> - 2020-05-04 10:27 -0700
                Re: longer 'char literals' meaning in c antispam@math.uni.wroc.pl - 2020-05-05 00:47 +0000
                Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-05-04 20:08 -0700
                Re: longer 'char literals' meaning in c James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-05-04 23:52 -0400
                Re: longer 'char literals' meaning in c antispam@math.uni.wroc.pl - 2020-05-05 17:10 +0000
                Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-05-05 13:41 -0700
                Re: longer 'char literals' meaning in c antispam@math.uni.wroc.pl - 2020-05-05 22:29 +0000
                Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-05-05 16:18 -0700
                Re: longer 'char literals' meaning in c antispam@math.uni.wroc.pl - 2020-05-06 02:33 +0000
                Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-05-05 20:06 -0700
                Re: longer 'char literals' meaning in c antispam@math.uni.wroc.pl - 2020-05-06 18:57 +0000
                Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-05-06 13:37 -0700
                Re: longer 'char literals' meaning in c Spiros Bousbouras <spibou@gmail.com> - 2020-05-07 13:48 +0000
                Re: longer 'char literals' meaning in c Spiros Bousbouras <spibou@gmail.com> - 2020-05-07 13:58 +0000
                Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-05-07 18:01 -0700
                Re: longer 'char literals' meaning in c James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-05-05 20:18 -0400
                Re: longer 'char literals' meaning in c antispam@math.uni.wroc.pl - 2020-05-06 20:01 +0000
                Re: longer 'char literals' meaning in c James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-05-06 18:20 -0400
                Re: longer 'char literals' meaning in c Siri Cruise <chine.bleu@yahoo.com> - 2020-04-30 20:13 -0700
      Re: longer 'char literals' meaning in c Bonita Montero <Bonita.Montero@gmail.com> - 2020-04-30 16:58 +0200
        Re: longer 'char literals' meaning in c Bonita Montero <Bonita.Montero@gmail.com> - 2020-04-30 16:59 +0200
        Re: longer 'char literals' meaning in c Bonita Montero <Bonita.Montero@gmail.com> - 2020-04-30 17:14 +0200
        Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 08:33 -0700
          Re: longer 'char literals' meaning in c Bonita Montero <Bonita.Montero@gmail.com> - 2020-04-30 18:15 +0200
      Re: longer 'char literals' meaning in c James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-04-30 08:33 -0700
        Re: longer 'char literals' meaning in c David Brown <david.brown@hesbynett.no> - 2020-04-30 17:49 +0200
          Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-04-30 17:23 +0100
            Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 09:38 -0700
              Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-04-30 17:56 +0100
                Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 10:04 -0700
                Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-04-30 18:28 +0100
                Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 10:39 -0700
                Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-04-30 19:16 +0100
                Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 11:24 -0700
                Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-04-30 19:58 +0100
                Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 12:08 -0700
                Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-04-30 20:16 +0100
                Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 12:29 -0700
                Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 12:10 -0700
                Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 11:17 -0700
                Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 10:31 -0700
                Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-04-30 19:20 +0100
                Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 11:28 -0700
          Re: longer 'char literals' meaning in c Richard Damon <Richard@Damon-Family.org> - 2020-04-30 13:48 -0400
        Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 09:01 -0700
      Re: longer 'char literals' meaning in c Vir Campestris <vir.campestris@invalid.invalid> - 2020-04-30 21:32 +0100
        Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 13:43 -0700
        Re: longer 'char literals' meaning in c Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2020-04-30 16:54 -0400
          Re: longer 'char literals' meaning in c Vir Campestris <vir.campestris@invalid.invalid> - 2020-05-03 21:23 +0100
            Re: longer 'char literals' meaning in c Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2020-05-03 16:48 -0400
  Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 11:38 -0700
    Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 11:57 -0700
      Re: longer 'char literals' meaning in c Bonita Montero <Bonita.Montero@gmail.com> - 2020-04-30 21:01 +0200
      Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-04-30 20:07 +0100
        Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 12:41 -0700
        Re: longer 'char literals' meaning in c Tim Rentsch <tr.17687@z991.linuxsc.com> - 2020-05-04 10:30 -0700

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