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It is correct to say C's switch is O(1).

Theoritically speaking, BrowserUK is also wrong when he said O(1) means test once. However he had something in () said "in this case", which made himself "politically" right ;-)

Strictly speaking, O(1) means that the cost is a constant, not a function of any variable, thus it is considered ideal, as the cost is 100% predictable. The complexity (worst scenario cost) of the switch statement is determined at the coding time, not base on the input data at execution time.

C's switch statement falls into this category. I personally believe that there is a benefit to have it in Perl.


In reply to Re: Re: Re: Perl Idioms Explained: && and || "Short Circuit" operators by pg
in thread Perl Idioms Explained - && and || "Short Circuit" operators by davido

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    [Discipulus]: in this case Corion we are speaking about software licensing: evry year or two we must rescan the whole ced to produce an excel report, while at every activation / disactivation we update a black box DB: i said that i a week i can produce the perl to..
    [Discipulus]: rend out the xls IF i have access to the DB
    [choroba]: LanX I miss working in a bank sometimes...
    [Corion]: Discipulus: Ooof. Especially yearly things are things I like to automate instead of trying to remember how I did things last year...
    [Corion]: And the second rule that I've learned is, that there is no one-off job, so writing a program for it pays off almost immediately. The third rule is to give all my programs numbers and have them reproduce that number in the name of their output files. :)
    [Discipulus]: the true part is that also specification change between years.. but well our job is cheap but dont abuse of us.. ;=)
    [LanX]: Choroba: do you miss chaos with ties? apply at the US government.. ;)
    [ambrus]: Corion: those are good rules.

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