Best search algorithm to find condition within a range

Steven D'Aprano steve+comp.lang.python at pearwood.info
Thu Apr 9 17:21:46 CEST 2015


On Fri, 10 Apr 2015 01:02 am, Chris Angelico wrote:

> On Fri, Apr 10, 2015 at 12:53 AM, Alain Ketterlin
> <alain at dpt-info.u-strasbg.fr> wrote:
>> Ouch, you're right, I tried to stick with Marko's example and forgot the
>> basics. I meant "signed ints", but the "removable" condition should be
>> something like:
>>
>>     if ( x>0 && y>0 && z<x )
>>         ...
>>
>> i.e., some condition that is never true (either false or undefined).
>> Thanks for the correction.
> 
> Ah, yep. And yes, that's absolutely right - the compiler's allowed to
> treat that as never true.

Am I missing something? Did you over-trim the quoting?

How can the compiler possibly be allowed to treat x>0 && y>0 && z<x as
always false?

x = y = 1
z = 0

gives x>0 && y>0 && z<x as true.



-- 
Steven




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