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| From | Phil Carmody <thefatphil_demunged@yahoo.co.uk> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); |
| Date | 2011-07-29 01:51 +0300 |
| Organization | A noiseless patient Spider |
| Message-ID | <87oc0enhmf.fsf@bazspaz.fatphil.org> (permalink) |
| References | (2 earlier) <lnipqujmlq.fsf@nuthaus.mib.org> <877h7at8p3.fsf@bazspaz.fatphil.org> <ln1uxijcm2.fsf@nuthaus.mib.org> <87ei1irn2s.fsf@bazspaz.fatphil.org> <gsKdnVjBOdpRDrDTnZ2dnUVZ_hOdnZ2d@bestweb.net> |
Kenneth Brody <kenbrody@spamcop.net> writes:
> On 7/22/2011 6:02 PM, Phil Carmody wrote:
> > Keith Thompson<kst-u@mib.org> writes:
> >> Phil Carmody<thefatphil_demunged@yahoo.co.uk> writes:
> >>> Keith Thompson<kst-u@mib.org> writes:
> >>>> gwowen<gwowen@gmail.com> writes:
> [...]
> >>>>> Half-remembered saws like "Goto considered harmful" will never beat
> >>>>> clear thinking.
> >>>>
> >>>> But break and continue aren't *just* disguised gotos. They're
> >>>> tightly restricted gotos. They branch only to a specific point in
> >>>> the code (the end of a certain construct), and unlike gotos they
> >>>> can't branch to an earlier point in the code.
> >>>
> >>> Continue can. And does. Always.
>
> I thought the same thing at first.
>
> > Yes, this is wrong. But I think only 1/3 wrong.
> >
> >> C99 6.8.6.2 (emphasis added):
> >>
> >> A continue statement causes a jump to the loop-continuation
> >> portion of the smallest enclosing iteration statement; that is,
> >> *to the end* of the loop body.
> >>
> >> The (optional) subsequent branch to the top of the loop is the normal
> >> operation of the loop itself, not a result of the continue statement.
> >
> > Hmmm, I think I disagree. It is for a do {} while, certainly. However,
> > in the absense of a definition of "loop-continuation portion", For me
> > it's obviously expression_3 for a for loop (which is at the top) and
> > the condition for a while loop (which is at the top). Their
> > explication introduces more contradiction than explanation. So, to
> > their "that is", I'd say "no, that isn't". It would have been better
> > if they'd just used the final clause. Were I to be pedantic, I'd take
> > issue with your '(optional)' is 2/3 wrong, as it's not optional in
> > whiles and fors, only in dos.
>
> But, consider that, if you were to use a "goto" to the top of the for-
> or while-loop
But which *bit* of the top, the top's large and has many stages in the
case of a for loop?
>, rather than "continue", the conditions would not be
> re-tested, nor would the for-loop's "expression_3" be executed.
> Therefore, while the code that gets executed is at the top, it only
> happens because you hit the bottom.
Because you restricted your 'jump' to 'goto', but we're not constrained
by 'goto', merely jumping.
Phil
--
Humans will have advanced a long, long, way when religious
belief has a cozy little classification in the DSM.
-- David Melville (on r.a.s.f1)
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do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Francois Grieu <fgrieu@gmail.com> - 2011-07-22 08:49 +0200
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); "Kleuskes & Moos" <kleuske@xs4all.nl> - 2011-07-22 00:58 -0700
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); gwowen <gwowen@gmail.com> - 2011-07-22 01:46 -0700
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); gazelle@shell.xmission.com (Kenny McCormack) - 2011-07-22 13:16 +0000
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); "Kleuskes & Moos" <kleuske@xs4all.nl> - 2011-07-22 06:35 -0700
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); tom st denis <tom@iahu.ca> - 2011-07-22 08:37 -0700
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Kenneth Brody <kenbrody@spamcop.net> - 2011-07-22 12:20 -0400
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Francois Grieu <fgrieu@gmail.com> - 2011-07-22 16:41 +0200
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Kenneth Brody <kenbrody@spamcop.net> - 2011-07-22 12:10 -0400
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-07-22 19:39 +0100
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); luser- -droog <mijoryx@yahoo.com> - 2011-07-22 21:05 -0700
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-07-23 13:24 +0100
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); gazelle@shell.xmission.com (Kenny McCormack) - 2011-07-23 15:11 +0000
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); "io_x" <a@b.c.invalid> - 2011-07-23 22:16 +0200
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Keith Thompson <kst-u@mib.org> - 2011-07-22 09:39 -0700
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-07-22 22:30 +0300
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Keith Thompson <kst-u@mib.org> - 2011-07-22 13:15 -0700
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-07-23 01:02 +0300
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Jens Schweikhardt <usenet@schweikhardt.net> - 2011-07-23 13:06 +0000
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-07-23 16:51 +0300
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Kenneth Brody <kenbrody@spamcop.net> - 2011-07-25 12:06 -0400
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Jens Schweikhardt <usenet@schweikhardt.net> - 2011-07-25 20:39 +0000
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Kenneth Brody <kenbrody@spamcop.net> - 2011-07-26 10:43 -0400
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Keith Thompson <kst-u@mib.org> - 2011-07-26 08:58 -0700
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Kenneth Brody <kenbrody@spamcop.net> - 2011-07-25 12:03 -0400
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-07-29 01:51 +0300
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); August Karlstrom <fusionfile@gmail.com> - 2011-07-22 12:15 +0200
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Francois Grieu <fgrieu@gmail.com> - 2011-07-22 16:11 +0200
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); "Kleuskes & Moos" <kleuske@xs4all.nl> - 2011-07-22 08:14 -0700
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Thomas Boell <tboell@domain.invalid> - 2011-07-29 14:38 +0200
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); James Kuyper <jameskuyper@verizon.net> - 2011-07-29 09:23 -0400
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Thomas Boell <tboell@domain.invalid> - 2011-07-29 15:58 +0200
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); James Kuyper <jameskuyper@verizon.net> - 2011-07-29 10:42 -0400
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Willem <willem@toad.stack.nl> - 2011-07-29 14:56 +0000
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); James Kuyper <jameskuyper@verizon.net> - 2011-07-29 20:47 -0400
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Willem <willem@toad.stack.nl> - 2011-07-30 09:12 +0000
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); James Kuyper <jameskuyper@verizon.net> - 2011-07-30 07:30 -0400
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Thomas Boell <tboell@domain.invalid> - 2011-07-29 17:08 +0200
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Ali <abdulrazaq@gmail.com> - 2011-07-29 08:21 -0700
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Kenneth Brody <kenbrody@spamcop.net> - 2011-07-22 12:24 -0400
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Francois Grieu <fgrieu@gmail.com> - 2011-07-25 10:34 +0200
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Willem <willem@toad.stack.nl> - 2011-07-25 08:54 +0000
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Keith Thompson <kst-u@mib.org> - 2011-07-25 09:08 -0700
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Willem <willem@toad.stack.nl> - 2011-07-25 16:52 +0000
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Keith Thompson <kst-u@mib.org> - 2011-07-25 11:37 -0700
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); cri@tiac.net (Richard Harter) - 2011-07-25 20:16 +0000
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Francois Grieu <fgrieu@gmail.com> - 2011-07-26 10:23 +0200
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-07-26 00:49 -0700
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); "io_x" <a@b.c.invalid> - 2011-07-26 11:16 +0200
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-07-26 03:09 -0700
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); "io_x" <a@b.c.invalid> - 2011-07-26 19:21 +0200
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-07-27 00:43 -0700
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); "io_x" <a@b.c.invalid> - 2011-07-27 11:29 +0200
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Keith Thompson <kst-u@mib.org> - 2011-07-27 08:30 -0700
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Kenneth Brody <kenbrody@spamcop.net> - 2011-07-26 10:39 -0400
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Hallvard B Furuseth <h.b.furuseth@usit.uio.no> - 2011-07-26 12:37 +0200
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Francois Grieu <fgrieu@gmail.com> - 2011-07-26 12:52 +0200
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Hallvard B Furuseth <h.b.furuseth@usit.uio.no> - 2011-07-26 13:18 +0200
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Keith Thompson <kst-u@mib.org> - 2011-07-26 08:57 -0700
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Hallvard B Furuseth <h.b.furuseth@usit.uio.no> - 2011-07-27 10:18 +0200
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Ali <abdulrazaq@gmail.com> - 2011-07-23 15:38 -0700
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Ali <abdulrazaq@gmail.com> - 2011-07-24 09:25 -0700
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-07-26 01:01 -0700
Re: do{switch(0)default:{/*break or continue*/;}/*cleanup*/}while(0); gwowen <gwowen@gmail.com> - 2011-07-25 03:08 -0700
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