Path: csiph.com!eternal-september.org!feeder.eternal-september.org!reader01.eternal-september.org!.POSTED!not-for-mail
From: Keith Thompson <kst-u@mib.org>
Newsgroups: comp.lang.c
Subject: Re: [ On topic, amazingtly ]: labels and declarations
Date: Mon, 25 Mar 2019 13:17:35 -0700
Organization: None to speak of
Lines: 35
Message-ID: <lnimw6bteo.fsf@kst-u.example.com>
References: <q6lmi9$1md$1@news.xmission.com> <q6m2u6$mho$1@dont-email.me> <A4AjE.133834$y65.133545@fx44.iad> <8gAjE.142392$tK1.4950@fx28.am4> <q70f9c$ar7$1@gioia.aioe.org> <f6l89el6s9sst13gt0tsc2idd8kpsn9cbr@4ax.com> <q733ed$25e$1@gioia.aioe.org> <lno962g4kb.fsf@kst-u.example.com> <q75ps0$1sic$1@gioia.aioe.org> <lntvfte7v1.fsf@kst-u.example.com> <77b0609f-f653-45bf-ae78-f202d46e7ea7@googlegroups.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Injection-Info: reader02.eternal-september.org; posting-host="784bbd8fb1c90ff7036d4663e7b2295d"; logging-data="3087"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX1/OZ32MU9P6jnt6tMtFOIzE"
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux)
Cancel-Lock: sha1:NNZjQ6DB+a7JUi7oMkqJreuJ80M= sha1:Ot6pB9SItisDQ6p8UpepYUyJJsE=
Xref: csiph.com comp.lang.c:142436

James Kuyper <jameskuyper@alumni.caltech.edu> writes:
> On Saturday, March 23, 2019 at 2:58:05 PM UTC-4, Keith Thompson wrote:
> ...
>> Prior to C99, it wasn't possible to mix declarations and statements
>> within a block, and it wouldn't have made much sense to allow labels
>> on declarations (though I suppose it could have been permitted).
>
> In general, if you have any good reason to write:
>
>     int var;
>     label: var=expression;
>
> Then it would be more convenient if we were allowed to write
>
>     label: int var=expression;
>
> for precisely the same reason that would apply if "label:" were removed
> entirely. That would have been true even in C90, but the relaxation of
> the restrictions on initializers in C99 would have made this issue more
> likely to come up. I think that the main reason this hasn't been a big
> issue is the unpopularity of labels in general.

Agreed.  But if I wanted to write:

    label: int var = expression;

I'd just write:

    label:;
    int var = expression;

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Will write code for food.
void Void(void) { Void(); } /* The recursive call of the void */