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From: Keith Thompson <Keith.S.Thompson+u@gmail.com>
Newsgroups: comp.lang.c
Subject: Re: Why is this happening?
Date: Fri, 27 Mar 2026 20:41:46 -0700
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Lawrence D’Oliveiro <ldo@nz.invalid> writes:
> On Fri, 27 Mar 2026 10:15:23 +0100, Josef Möllers 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;

(I would have preferred underscores, but that would have conflicted
with C++'s user-defined literals.)

And of course any pre-C23 C compiler or any C compiler invoked in
pre-C23 mode, will not recognize digit separators (unless it supports
them as an extension).

-- 
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
void Void(void) { Void(); } /* The recursive call of the void */