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" <[EMAIL PROTECTED]> To: <[email protected]> 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" <[EMAIL PROTECTED]> > To: <[email protected]> > 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" <[EMAIL PROTECTED]> >> To: <[email protected]> >> 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 <*> To visit your group on the web, go to: http://groups.yahoo.com/group/amibroker/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/amibroker/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
