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From: Tim Rentsch <tr.17687@z991.linuxsc.com>
Newsgroups: comp.lang.c
Subject: Re: Why is this happening?
Date: Sat, 28 Mar 2026 19:12:05 -0700
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scott@slp53.sl.home (Scott Lurndal) writes:

> Keith Thompson <Keith.S.Thompson+u@gmail.com> writes:
>
>> Lawrence D <<E2>> ??Oliveiro <ldo@nz.invalid> writes:
>>
>>> On Fri, 27 Mar 2026 10:15:23 +0100, Josef M@C3{B6}llers wrote:
>>>
>>>>      diffns += 1000000000UL;
>>>
>>> Can you write
>>>
>>>       diffns += 1_000_000_000UL;
>>>
>>> yet?
>>
>> Not in C.  C23 introduces the apostrophe as a digit separator, copied
>> from C++:
>>
>>      diffns += 1'000'000'000UL;
>
> Or diffns += 1000ul * 1000ul * 1000ul;
>
> or diffns += 1 * NS_PER_SEC;
>
> with
> #define NS_PER_SEC ((1000ul * 1000ul * 1000ul))
>
>> (I would have preferred underscores, but that would have conflicted
>> with C++'s user-defined literals.)
>
> Likewise, I'd prefer the underscore.

Ditto.  And there is no reason C could have allowed both,
and C++ be damned.