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Empty block in if....else construct. OK?
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Join Date: Jun 2006
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Posting Whiz in Training
Hello everyone. I was just wondering if it is OK to do this:
i.e. have an empty block attached to an if, elsif or else. It might sound like an odd question, but I don't want to put undefined behaviour into my program by breaking some obscure rule. Any advice appriciated.
Steven.
perl Syntax (Toggle Plain Text)
i.e. have an empty block attached to an if, elsif or else. It might sound like an odd question, but I don't want to put undefined behaviour into my program by breaking some obscure rule. Any advice appriciated.
Steven.
Last edited by Mushy-pea; Dec 16th, 2006 at 3:47 pm.
The one question you should not ask when teaching a new language structure is "Do you understand?". Do you understand?
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Join Date: Mar 2006
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Practically a Posting Shark
technically, as far as I know, it is OK. In general I would say it's not good practice unless it's clear why you needed to do that or put comments in the code explaining why you are doing that. Like in the CGI module you will see a sub routine that is just an empty block:
as the comment notes it's just there to avoid a warning message. In your case make sure it's really necessary, there is probably a better way to do whatever it is you are doing but can't tell by the sample code you posted.
Perl Syntax (Toggle Plain Text)
as the comment notes it's just there to avoid a warning message. In your case make sure it's really necessary, there is probably a better way to do whatever it is you are doing but can't tell by the sample code you posted.
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Join Date: Jun 2006
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Posting Whiz in Training
Thanks Kevin. Actually, I have decided to release the application I am working on (perlBB) as open source software. So, if you want to have a peek at the code you can visit the project home page on Sourceforge (http://sourceforge.net/projects/perlbb ). The if....else construct I mentioned is in "sub update_list" in /perlbb_0_4/forum.pl.
Steven.
Steven.
The one question you should not ask when teaching a new language structure is "Do you understand?". Do you understand?
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Practically a Posting Shark
Good luck with the project.
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Join Date: Mar 2006
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Practically a Posting Shark
You might want to read this:
http://perldoc.perl.org/perlstyle.html
http://perltidy.sourceforge.net/
http://perldoc.perl.org/perlstyle.html
http://perltidy.sourceforge.net/
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Join Date: May 2006
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Junior Poster in Training
Hi,
you should be aware that using '==' you can compare numbers, not strings. Strings however can be compared with 'eq', 'ne' etc.
Svet
you should be aware that using '==' you can compare numbers, not strings. Strings however can be compared with 'eq', 'ne' etc.
Svet
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Join Date: Jun 2006
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Posting Whiz in Training
Thanks for the advice guys. I have rewritten the part of my program that contained the empty block to avoid it, as I agree its not good aesthetically.
Steven.
Steven.
The one question you should not ask when teaching a new language structure is "Do you understand?". Do you understand?
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