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| From | Keith Thompson <Keith.S.Thompson+u@gmail.com> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: Why is this happening? |
| Date | 2026-03-28 10:18 -0700 |
| Organization | None to speak of |
| Message-ID | <874ilzx47j.fsf@example.invalid> (permalink) |
| References | (1 earlier) <10q523v$3e865$1@dont-email.me> <n2n05bFmg8nU2@mid.individual.net> <10q7bug$7vod$1@dont-email.me> <87bjg8wrgl.fsf@example.invalid> <CfSxR.24256$eG1.15763@fx33.iad> |
scott@slp53.sl.home (Scott Lurndal) writes:
> Keith Thompson <Keith.S.Thompson+u@gmail.com> writes:
>>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;
>
> Or diffns += 1000ul * 1000ul * 1000ul;
>
> or diffns += 1 * NS_PER_SEC;
>
> with
> #define NS_PER_SEC ((1000ul * 1000ul * 1000ul))
Why the "1 *"? And why two sets of parentheses?
An integer constant is always of a type big enough to hold its value.
The same does not hold for larger expressions. It doesn't matter in
this case, since ULONG_MAX is guaranteed to be bigger than
1'000'000'000, but it can be a problem in more general cases.
>>(I would have preferred underscores, but that would have conflicted
>>with C++'s user-defined literals.)
>
> Likewise, I'd prefer the underscore. IIRC, that's what is used
> in Verilog.
And Python, and Perl, and Ada, and a number of other languages.
--
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
void Void(void) { Void(); } /* The recursive call of the void */
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