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From: BGB <cr88192@gmail.com>
Newsgroups: comp.lang.c
Subject: Re: "A diagram of C23 basic types"
Date: Thu, 3 Apr 2025 01:28:14 -0500
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On 4/3/2025 1:12 AM, Keith Thompson wrote:
> Kaz Kylheku <643-408-1753@kylheku.com> writes:
>> On 2025-04-03, bart <bc@freeuk.com> wrote:
>>> On 02/04/2025 17:20, Scott Lurndal wrote:
>>>> Muttley@dastardlyhq.com writes:
>>>>> On Wed, 2 Apr 2025 16:33:46 +0100
>>>>> bart <bc@freeuk.com> gabbled:
>>>>>> On 02/04/2025 16:12, Muttley@DastardlyHQ.org wrote:
>>>>>>> Meh.
>>>>>>
>>>>>> What's the problem with it? Here, tell me at a glance the magnitude of
>>>>>> this number:
>>>>>>
>>>>>>       10000000000
>>>>>
>>>>> And how often do you hard code values that large into a program? Almost
>>>>> never I imagine unless its some hex value to set flags in a word.
>>>>
>>>> Every day, several times a day. 16 hex digit constants are very
>>>> common in my work.  The digit separator really helps with readability,
>>>> although I would have preferred '_' over "'".
>>>
>>> Oh, I thought C23 used '_', since Python uses that. I prefer single
>>> quote as that is not shifted on my keyboard. (My language projects just
>>> allow both!)
>>
>> I made , (comma) the digit separator in TXR Lisp. Nobody uses _ in the
>> real world.
>>
>> I understand that in some countries, that is the decimal point.  That is
>> not relevant in programming languages that use a period for that and are
>> not localized.
>>
>> Comma means I can just copy and paste a figure from a financial document
>> or application, or any other document which uses that convention.
> 
> The comma couldn't be used in C without the possibility of breaking
> existing code, since 123,456 is already a valid expression, and is
> likely to occur in a context like `foo(123,456)`.
> 
> C23 borrowed 123'456 from C++ rather than 123_456 (which I would have
> preferred).  C++ chose 123'456 because the C++ already used the
> underscore for user-defined literals.  Apparently some countries, such
> as Switzerland, use the apostrophe as a digit separator.
> 

In my compiler, I did both ' and _, ...
Personally though, I prefer using _ as a digit separator in these scenarios.

But, yeah, can't use comma without creating syntactic ambiguity.