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Groups > comp.lang.c > #151891

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 15:30 -0700
Organization None to speak of
Message-ID <874kt061yl.fsf@nosuchdomain.example.com> (permalink)
References (1 earlier) <r8eebl$ru0$1@news.albasani.net> <9bf151f2-e3f8-488b-bf10-9ba136d23a4f@googlegroups.com> <DZzqG.217998$dx4.55655@fx05.am4> <87sggk665l.fsf@nosuchdomain.example.com> <znHqG.187261$vn2.19120@fx34.am4>

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Bart <bc@freeuk.com> writes:
> On 30/04/2020 22:00, Keith Thompson wrote:
>> Bart <bc@freeuk.com> writes:
>>> C with 32-bit ints also limit the length to 4 characters.
>>
>> No it doesn't.  gcc does print a warning for 'ABCDE':
>>
>>      warning: character constant too long for its type
>>
>> but that's not a required diagnostic, just something that gcc chooses to
>> warn about.  It prints a different warning for *any* multi-character
>> constant:
>>
>>      warning: multi-character character constant [-Wmultichar]
>>
>> That's not a required diagnostic either.  Both 'ABCD' and 'ABCDE'
>> are conforming, with implementation-defined (and not necessarily
>> distinct) values of type int.  A compiler that rejects 'ABCDE'
>> because it won't fit in an int would be non-conforming.  (gcc gives
>> 'ABCDE' the same value as 'BCDE'.)
>
> So it limits the length to 4 characters as I said. That it ends up
> with 'BCDE' rather than 'ABCD' is because the 'E' is the least
> significant byte of the int, as gcc does it, and the 'A'  would have
> occupied bit 33 upwards.

When you said it limits the length to 4 characters, I took that to mean
that 'ABCDE' would be invalid (and you did show a warning).

There is no specified limit on the number of characters in a
multi-character constant.  (A compiler can limit logical source lines to
4095 characters, but is not required to impose any limit at all.)

[...]

> For example when was L'...' introduced'?

ANSI C, 1989 (or likely earlier in some implementations).

[...]

-- 
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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