Beefy Boxes and Bandwidth Generously Provided by pair Networks
The stupid question is the question not asked
 
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

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1018151]
help
Chatterbox?
roho replaces stale cookies with fresh on the platter on the sideboard.
roho takes a cookie from the platter on the sideboard.
roho takes a handful of cookies from the platter on the sideboard.
roho gets a cup of tea to dunk cookies.

How do I use this? | Other CB clients
Other Users?
Others chilling in the Monastery: (7)
As of 2017-04-27 09:45 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    I'm a fool:











    Results (502 votes). Check out past polls.