Groups > comp.lang.c > #92026

Re: sizeof Data types

From	Keith Thompson <kst-u@mib.org>
Newsgroups	comp.lang.c
Subject	Re: sizeof Data types
Date	2016-08-09 10:43 -0700
Organization	None to speak of
Message-ID	<ln1t1xvnw9.fsf@kst-u.example.com> (permalink)
References	<no34bv$1rus$1@gioia.aioe.org> <de7129d4-a523-4a52-b153-56d61f302927@googlegroups.com> <nod2mm$ubb$2@dont-email.me>

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Ken Brody <kenbrody@spamcop.net> writes:
> On 8/8/2016 3:38 PM, John Bode wrote:
> [...]
>> C99 introduced fixed-size types like int16_t and uint32_t which take up
>> exactly as many bits as it says on the label, but they don't have to be
>> supported by an implementation.
>
> My complaint is that, AFAIK, they didn't specify a way for you to know
> if a given size is supported, short of having the compile fail on you
> if you used it.
>
> If there is a way, please let me know.

#include <stdint.h>
...
#ifdef INT32_MAX
    puts("This system has int32_t");
#else
    puts("This system does not have int32_t");
#endif

Writing appropriate code for the #else branch is left as an exercise.
(Very often failing to compile is the best thing to do.)

-- 
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"

Thread

sizeof Data types Real Troll <real.troll@trolls.com> - 2016-08-05 18:45 -0400
  sizeof Data types jameskuyper@verizon.net - 2016-08-05 17:10 -0700
  Re: sizeof Data types raltbos@xs4all.nl (Richard Bos) - 2016-08-06 10:35 +0000
  Re: sizeof Data types raltbos@xs4all.nl (Richard Bos) - 2016-08-06 10:36 +0000
  Re: sizeof Data types Jean-Marc Bourguet <jm@bourguet.org> - 2016-08-06 22:29 +0200
    Re: sizeof Data types Ken Brody <kenbrody@spamcop.net> - 2016-08-09 12:55 -0400
  Re: sizeof Data types BartC <bc@freeuk.com> - 2016-08-06 21:43 +0100
    Re: sizeof Data types jameskuyper@verizon.net - 2016-08-06 15:25 -0700
      Re: sizeof Data types David Brown <david.brown@hesbynett.no> - 2016-08-08 09:48 +0200
        Re: sizeof Data types James Kuyper <jameskuyper@verizon.net> - 2016-08-08 11:05 -0400
          Re: sizeof Data types David Brown <david.brown@hesbynett.no> - 2016-08-08 17:57 +0200
        Re: sizeof Data types supercat@casperkitty.com - 2016-08-08 08:36 -0700
          Re: sizeof Data types David Brown <david.brown@hesbynett.no> - 2016-08-08 19:05 +0200
            Re: sizeof Data types supercat@casperkitty.com - 2016-08-08 14:09 -0700
              Re: sizeof Data types David Brown <david.brown@hesbynett.no> - 2016-08-09 09:38 +0200
                Re: sizeof Data types Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-08-09 11:23 +0100
                Re: sizeof Data types Tim Rentsch <txr@alumni.caltech.edu> - 2016-08-12 07:42 -0700
                Re: sizeof Data types Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-08-12 21:38 +0100
                Re: sizeof Data types Keith Thompson <kst-u@mib.org> - 2016-08-09 08:12 -0700
                Re: sizeof Data types supercat@casperkitty.com - 2016-08-10 10:36 -0700
                Re: sizeof Data types Keith Thompson <kst-u@mib.org> - 2016-08-10 11:42 -0700
      Re: sizeof Data types Philip Lantz <prl@canterey.us> - 2016-08-11 10:20 -0700
        Re: sizeof Data types Keith Thompson <kst-u@mib.org> - 2016-08-11 12:04 -0700
        Re: sizeof Data types Tim Rentsch <txr@alumni.caltech.edu> - 2016-08-12 08:22 -0700
    Re: sizeof Data types Nobody <nobody@nowhere.invalid> - 2016-08-07 01:32 +0100
      Re: sizeof Data types Keith Thompson <kst-u@mib.org> - 2016-08-06 18:10 -0700
  Re: sizeof Data types Siri Cruise <chine.bleu@yahoo.com> - 2016-08-06 20:22 -0700
    Re: sizeof Data types Ian Collins <ian-news@hotmail.com> - 2016-08-07 15:40 +1200
    Re: sizeof Data types Ken Brody <kenbrody@spamcop.net> - 2016-08-09 13:06 -0400
      Re: sizeof Data types Siri Cruise <chine.bleu@yahoo.com> - 2016-08-09 12:37 -0700
        Re: sizeof Data types Tim Rentsch <txr@alumni.caltech.edu> - 2016-08-11 09:18 -0700
          Re: sizeof Data types Siri Cruise <chine.bleu@yahoo.com> - 2016-08-11 11:11 -0700
            Re: sizeof Data types Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2016-08-11 12:26 -0600
              Re: sizeof Data types David Brown <david.brown@hesbynett.no> - 2016-08-11 23:31 +0200
                Re: sizeof Data types supercat@casperkitty.com - 2016-08-11 14:59 -0700
              Re: sizeof Data types Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-08-12 00:15 -0700
            Re: sizeof Data types Tim Rentsch <txr@alumni.caltech.edu> - 2016-08-12 08:05 -0700
  Re: sizeof Data types John Bode <jfbode1029@gmail.com> - 2016-08-08 12:38 -0700
    Re: sizeof Data types Ken Brody <kenbrody@spamcop.net> - 2016-08-09 13:08 -0400
      Re: sizeof Data types Keith Thompson <kst-u@mib.org> - 2016-08-09 10:43 -0700
      Re: sizeof Data types "James R. Kuyper" <jameskuyper@verizon.net> - 2016-08-09 13:41 -0400
        Re: sizeof Data types Ken Brody <kenbrody@spamcop.net> - 2016-08-10 11:51 -0400
          Re: sizeof Data types "James R. Kuyper" <jameskuyper@verizon.net> - 2016-08-10 12:35 -0400
            Re: sizeof Data types Ken Brody <kenbrody@spamcop.net> - 2016-08-11 11:53 -0400
              Re: sizeof Data types "James R. Kuyper" <jameskuyper@verizon.net> - 2016-08-13 11:29 -0400
                Re: sizeof Data types supercat@casperkitty.com - 2016-08-13 09:18 -0700
          Re: sizeof Data types Keith Thompson <kst-u@mib.org> - 2016-08-10 10:13 -0700
            Re: sizeof Data types Ken Brody <kenbrody@spamcop.net> - 2016-08-11 11:56 -0400
  Re: sizeof Data types Ken Brody <kenbrody@spamcop.net> - 2016-08-09 12:59 -0400
    Re: sizeof Data types "James R. Kuyper" <jameskuyper@verizon.net> - 2016-08-09 13:49 -0400
      Re: sizeof Data types Ken Brody <kenbrody@spamcop.net> - 2016-08-10 12:08 -0400
    Re: sizeof Data types Keith Thompson <kst-u@mib.org> - 2016-08-09 11:35 -0700

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