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Hello,
This is new feature introduced in one of recent BETAs and
not available in "official" guide.
It is however described here:
http://www.amibroker.com/guide/v50/keyword/switch.html
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
From: "t_ohrt" <to56@xxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Friday, May 25, 2007 6:23 PM
Subject: [amibroker] Re: Nested Switch() statements
Interesting topic, but where in the Amibroker user´s guide can I find
information covering the Switch() function?
T.O.
--- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@xxx>
wrote:
>
> Steve,
>
> No, I don't think it is worthwhile for speed reasons.
> In AFL speed of execution of switch statement vs if-else is almost
identical.
> The only reason for using switch is that the code may look
> "cleaner".
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
> ----- Original Message -----
> From: "Steve Dugas" <sjdugas@xxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Friday, May 25, 2007 5:26 PM
> Subject: Re: [amibroker] Re: Nested Switch() statements
>
>
> > Hi Tomasz - Do you thnk it is worthwhile ( maybe speed increase,
for
> > example? ) to convert existing if-else if-else if... over to
Switch() ?
> > Thank you!
> >
> > Steve
> >
> > ----- Original Message -----
> > From: "Tomasz Janeczko" <groups@xxx>
> > To: <amibroker@xxxxxxxxxxxxxxx>
> > Sent: Friday, May 25, 2007 7:32 AM
> > Subject: Re: [amibroker] Re: Nested Switch() statements
> >
> >
> >> Hello,
> >>
> >> Frankly speaking fall-through is one of BEST features of switch
()
> >> statement.
> >> I use it thousands of times. Implementations lacking that are
missing
> >> single most important thing in switch() statement.
> >>
> >> K&R "The C Programming Language" book is really recommended
reading.
> >>
> >> Best regards,
> >> Tomasz Janeczko
> >> amibroker.com
> >> ----- Original Message -----
> >> From: "Nigel Rowe" <rho@xxx>
> >> To: <amibroker@xxxxxxxxxxxxxxx>
> >> Sent: Friday, May 25, 2007 12:12 PM
> >> Subject: Re: [amibroker] Re: Nested Switch() statements
> >>
> >>
> >>> On Fri, 25 May 2007, Ton Sieverding wrote:
> >>>> Can you please explain me why 'switch statements are a frequent
> >>>> source of bugs' ? If the last CASE is a DEFAULT then all
possible
> >>>> cases are covered. Or am I missing something in the AFL SWITCH
> >>>> statement ?
> >>>>
> >>>> switch ( expression )
> >>>> {
> >>>> case constant-expression1 : statement;
> >>>> case constant-expression2 : statement;
> >>>> ...
> >>>> case constant-expressionN : statement;
> >>>>
> >>>> default : statement;
> >>>>
> >>>> }
> >>>>
> >>>>
> >>>> Ton.
> >>>
> >>> The 'standard' error when using a switch statement in 'C' and
presumably
> >>> AFL, is forgetting to put 'break;' statements in.
> >>>
> >>> To paraphrase your example (above) so it looks like this:-
> >>>
> >>> switch ( expression )
> >>> {
> >>> case constant-expression1 : statement1;
> >>> case constant-expression2 : statement2;
> >>> ...
> >>> case constant-expressionN : statementN;
> >>> default : statement_default;
> >>> }
> >>>
> >>> If you leave out the break statements, and
> >>> expression==constant_expression1 you will execute statement1
(what you
> >>> wanted) AND ALSO statement2 AND ALSO statement3 AND ALSO ...
statementN
> >>> AND ALSO statement_default.
> >>>
> >>> It's sometimes called the 'fall-through' bug. It's easy to
miss, can be
> >>> a right pain!
> >>>
> >>>
> >>> --
> >>> Nigel Rowe
> >>> rho \N{COMMERCIAL AT} swiftdsl \N{FULL STOP} com \N{FULL STOP}
au
> >>>
> >>>
> >>>
> >>> Please note that this group is for discussion between users
only.
> >>>
> >>> To get support from AmiBroker please send an e-mail directly to
> >>> SUPPORT {at} amibroker.com
> >>>
> >>> For NEW RELEASE ANNOUNCEMENTS and other news always check
DEVLOG:
> >>> http://www.amibroker.com/devlog/
> >>>
> >>> For other support material please check also:
> >>> http://www.amibroker.com/support.html
> >>>
> >>> Yahoo! Groups Links
> >>>
> >>>
> >>>
> >>>
> >>>
> >>
> >>
> >> Please note that this group is for discussion between users only.
> >>
> >> To get support from AmiBroker please send an e-mail directly to
> >> SUPPORT {at} amibroker.com
> >>
> >> For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> >> http://www.amibroker.com/devlog/
> >>
> >> For other support material please check also:
> >> http://www.amibroker.com/support.html
> >>
> >> Yahoo! Groups Links
> >>
> >>
> >>
> >>
> >
> >
> >
> >
> > Please note that this group is for discussion between users only.
> >
> > To get support from AmiBroker please send an e-mail directly to
> > SUPPORT {at} amibroker.com
> >
> > For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> > http://www.amibroker.com/devlog/
> >
> > For other support material please check also:
> > http://www.amibroker.com/support.html
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
>
Please note that this group is for discussion between users only.
To get support from AmiBroker please send an e-mail directly to
SUPPORT {at} amibroker.com
For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
http://www.amibroker.com/devlog/
For other support material please check also:
http://www.amibroker.com/support.html
Yahoo! Groups Links
Please note that this group is for discussion between users only.
To get support from AmiBroker please send an e-mail directly to
SUPPORT {at} amibroker.com
For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
http://www.amibroker.com/devlog/
For other support material please check also:
http://www.amibroker.com/support.html
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