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Re: Untillian Headache or about the semantic of until

by tmharish (Friar)
on Feb 11, 2013 at 14:10 UTC ( #1018151=note: print w/ replies, xml ) Need Help??


in reply to Untillian Headache or about the semantic of until

I cant say much about the semantics of until in the context that you have described it as neither English nor Italian are my native languages.

However I believe that the use of until and unless and the likes are dangerous for precisely this reason. I find it far better to use while( ! ) and if(!) for complex conditions.

Regarding the negation - You need to use De Morgan's laws for that negation. It essentially states:

NOT( A OR B ) <==> NOT(A) AND NOT(B) NOT( A AND B ) <==> NOT(A) OR NOT(B)

So
NOT( ($odometer[$wheel] < 9 || $wheel < 0) ) ==> NOT($odometer[$wheel] < 9 ) AND NOT ($wheel < 0) ==> $odometer[$wheel] >= 9 AND $wheel >= 0


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