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| From | Keith Thompson <Keith.S.Thompson+u@gmail.com> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: Why is this happening? |
| Date | 2026-03-29 13:54 -0700 |
| Organization | None to speak of |
| Message-ID | <87qzp2uzjc.fsf@example.invalid> (permalink) |
| References | (2 earlier) <n2n05bFmg8nU2@mid.individual.net> <10q7bug$7vod$1@dont-email.me> <87bjg8wrgl.fsf@example.invalid> <CfSxR.24256$eG1.15763@fx33.iad> <20260329115057.00003a47@yahoo.com> |
Michael S <already5chosen@yahoo.com> writes:
> On Sat, 28 Mar 2026 15:14:42 GMT
> scott@slp53.sl.home (Scott Lurndal) wrote:
>
>> Keith Thompson <Keith.S.Thompson+u@gmail.com> writes:
>> >Lawrence Dג€™Oliveiro <ldo@nz.invalid> writes:
>> >> On Fri, 27 Mar 2026 10:15:23 +0100, Josef M_¶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))
>
> Why not (int)1e9 ?
[...]
Because int is not guaranteed to be wider than 16 bits (though if
you're already relying on Windows or POSIX, you can assume it's at
least 32 bits). The original expression was of type unsigned long,
so (unsigned long)1e9 would be more nearly correct.
And because it's a floating-point to integer conversion in a
context that doesn't need floating-point. I'm not sure whether
(unsigned long)1e9 is actually guaranteed to yield 1000000000 rather
than 999999999. Maybe it is, but I don't want to waste brain cells
proving it.
--
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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Re: Why is this happening? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-04-06 12:11 -0700
Re: Why is this happening? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-04-06 14:20 -0700
Re: Why is this happening? Michael S <already5chosen@yahoo.com> - 2026-04-07 02:05 +0300
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