Re: Safety of casting from 'long' to 'int'

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From	Tim Rentsch <tr.17687@z991.linuxsc.com>
Newsgroups	comp.lang.c
Subject	Re: Safety of casting from 'long' to 'int'
Date	Sun, 24 May 2026 04:37:36 -0700
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Keith Thompson <Keith.S.Thompson+u@gmail.com> writes:

> Tim Rentsch <tr.17687@z991.linuxsc.com> writes:
>
>> Keith Thompson <Keith.S.Thompson+u@gmail.com> writes:
>>
>>> Tim Rentsch <tr.17687@z991.linuxsc.com> writes:
>>>
>>>> antispam@fricas.org (Waldek Hebisch) writes:
>>>>
>>>>> [...] for some time there was a belief that correct and full BNF
>>>>> for C was impossible to give or too messy.
>>>>
>>>> I find this statement hard to believe.  There is nothing especially
>>>> difficult about a syntax for the C language.  There is of course the
>>>> well-known problem with typedef names, but that has long been
>>>> understood to be unresolvable in any context-free way (and so cannot
>>>> be dealt with in BNF).  Earlier versions of C (pre-K&R) had other
>>>> syntax for some constructs, and maybe that was the issue.  I'm at a
>>>> loss to understand how people could have thought a BNF for C, for
>>>> the post K&R version of the language, would be challenging or
>>>> difficult.
>>>
>>> I'm having trouble figuring out what you mean here.  You acknowledge
>>> that typedefs make a full BNF grammar for C impossible, and then
>>> you say that it's not challenging or difficult.
>>
>> Because I think the problem with typedef names is orthogonal to
>> what Waldek was saying.  The problem with typedef names is not
>> solvable in a context-free grammar, and that is just as true today
>> as it was 50 years ago.  The syntax I am talking about is C syntax
>> without regard to the problem with typedef names.
>
> I still don't understand your point.  [...]

Yes, I can see that.

By the way, it wasn't a point, it was only an explanation.  I'm
sorry that it wasn't more understandable for you.

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Re: Safety of casting from 'long' to 'int' Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-05-14 02:59 +0200
  Re: Safety of casting from 'long' to 'int' cross@spitfire.i.gajendra.net (Dan Cross) - 2026-05-14 01:39 +0000
    Re: Safety of casting from 'long' to 'int' Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-05-14 03:57 +0200
      Re: Safety of casting from 'long' to 'int' David Brown <david.brown@hesbynett.no> - 2026-05-14 11:49 +0200
        Re: Safety of casting from 'long' to 'int' cross@spitfire.i.gajendra.net (Dan Cross) - 2026-05-14 10:57 +0000
      Re: Safety of casting from 'long' to 'int' cross@spitfire.i.gajendra.net (Dan Cross) - 2026-05-14 10:22 +0000
  Re: Safety of casting from 'long' to 'int' Bart <bc@freeuk.com> - 2026-05-14 12:32 +0100
    Re: Safety of casting from 'long' to 'int' Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-05-14 16:11 -0700
      Re: Safety of casting from 'long' to 'int' Bart <bc@freeuk.com> - 2026-05-15 01:12 +0100
      Re: Safety of casting from 'long' to 'int' Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-05-15 02:30 +0200
    Re: Safety of casting from 'long' to 'int' Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-05-15 02:38 +0200
    Re: Safety of casting from 'long' to 'int' James Kuyper <jameskuyper@alumni.caltech.edu> - 2026-05-18 19:48 -0400
      Re: Safety of casting from 'long' to 'int' Bart <bc@freeuk.com> - 2026-05-19 01:12 +0100
        Re: Safety of casting from 'long' to 'int' Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-05-18 19:22 -0700
          Re: Safety of casting from 'long' to 'int' Bart <bc@freeuk.com> - 2026-05-19 11:31 +0100
            Re: Safety of casting from 'long' to 'int' antispam@fricas.org (Waldek Hebisch) - 2026-05-19 12:21 +0000
              Re: Safety of casting from 'long' to 'int' Bart <bc@freeuk.com> - 2026-05-19 14:15 +0100
                Re: Safety of casting from 'long' to 'int' Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-05-19 14:14 -0700
              Re: Safety of casting from 'long' to 'int' Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-05-22 21:58 -0700
                Re: Safety of casting from 'long' to 'int' Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-05-22 23:23 -0700
                Re: Safety of casting from 'long' to 'int' Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-05-23 00:09 -0700
                Re: Safety of casting from 'long' to 'int' Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-05-23 04:13 -0700
                Re: Safety of casting from 'long' to 'int' Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-05-24 04:37 -0700
            Re: Safety of casting from 'long' to 'int' Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-05-19 14:12 -0700
              Re: Safety of casting from 'long' to 'int' Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-05-20 04:20 +0200
            Re: Safety of casting from 'long' to 'int' James Kuyper <jameskuyper@alumni.caltech.edu> - 2026-05-19 19:00 -0400
              Re: Safety of casting from 'long' to 'int' Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-05-19 16:56 -0700
        Re: Safety of casting from 'long' to 'int' James Kuyper <jameskuyper@alumni.caltech.edu> - 2026-05-19 11:31 -0400
  Re: Safety of casting from 'long' to 'int' Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-05-14 08:37 -0700
    Re: Safety of casting from 'long' to 'int' Bart <bc@freeuk.com> - 2026-05-14 17:00 +0100
      Re: Safety of casting from 'long' to 'int' Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-05-14 09:44 -0700
        Re: Safety of casting from 'long' to 'int' Bart <bc@freeuk.com> - 2026-05-14 18:57 +0100
      Re: Safety of casting from 'long' to 'int' David Brown <david.brown@hesbynett.no> - 2026-05-14 18:51 +0200
        Re: Safety of casting from 'long' to 'int' Bart <bc@freeuk.com> - 2026-05-14 19:19 +0100
          Re: Safety of casting from 'long' to 'int' David Brown <david.brown@hesbynett.no> - 2026-05-14 20:50 +0200
            Re: Safety of casting from 'long' to 'int' Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-05-15 02:52 +0200
              Re: Safety of casting from 'long' to 'int' Bart <bc@freeuk.com> - 2026-05-15 02:07 +0100
                Re: Safety of casting from 'long' to 'int' Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-05-15 03:39 +0200
                Re: Safety of casting from 'long' to 'int' Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-05-14 19:04 -0700
              Re: Safety of casting from 'long' to 'int' David Brown <david.brown@hesbynett.no> - 2026-05-15 10:27 +0200
              Re: Safety of casting from 'long' to 'int' tTh <tth@none.invalid> - 2026-05-15 12:25 +0200
      Re: Safety of casting from 'long' to 'int' Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-05-14 16:40 -0700
        Re: Safety of casting from 'long' to 'int' Bart <bc@freeuk.com> - 2026-05-15 01:31 +0100
          Re: Safety of casting from 'long' to 'int' Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-05-14 17:52 -0700
          Re: Safety of casting from 'long' to 'int' David Brown <david.brown@hesbynett.no> - 2026-05-15 10:32 +0200
            Re: Safety of casting from 'long' to 'int' Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-05-15 02:35 -0700
            Re: Safety of casting from 'long' to 'int' Bart <bc@freeuk.com> - 2026-05-15 11:38 +0100
              Re: Safety of casting from 'long' to 'int' cross@spitfire.i.gajendra.net (Dan Cross) - 2026-05-15 11:35 +0000
                Re: Safety of casting from 'long' to 'int' Bart <bc@freeuk.com> - 2026-05-15 13:05 +0100
              Re: Safety of casting from 'long' to 'int' David Brown <david.brown@hesbynett.no> - 2026-05-15 13:58 +0200
                Re: Safety of casting from 'long' to 'int' Bart <bc@freeuk.com> - 2026-05-15 14:54 +0100
                Re: Safety of casting from 'long' to 'int' Bart <bc@freeuk.com> - 2026-05-15 15:00 +0100
                Re: Safety of casting from 'long' to 'int' scott@slp53.sl.home (Scott Lurndal) - 2026-05-15 16:01 +0000
                Re: Safety of casting from 'long' to 'int' Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-05-15 12:23 -0700
                Re: Safety of casting from 'long' to 'int' Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-05-15 12:54 -0700
                Re: Safety of casting from 'long' to 'int' Bart <bc@freeuk.com> - 2026-05-15 21:39 +0100
                Re: Safety of casting from 'long' to 'int' Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-05-15 14:14 -0700
                Re: Safety of casting from 'long' to 'int' Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-05-16 00:44 +0200
                Re: Safety of casting from 'long' to 'int' Bart <bc@freeuk.com> - 2026-05-16 00:36 +0100
      Re: Safety of casting from 'long' to 'int' Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-05-15 02:46 +0200

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