Beefy Boxes and Bandwidth Generously Provided by pair Networks
Welcome to the Monastery
 
PerlMonks  

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


Comment on Re: Untillian Headache or about the semantic of until
Select or Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1018151]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others scrutinizing the Monastery: (8)
As of 2015-07-08 04:26 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (94 votes), past polls