OpenEuphoria

Re: Unknown as a legal var state?

• Posted by Juergen Luethje <jluethje at gmx.de> Nov 24, 2002
• 512 views

Rom wrote:

> From: "Juergen Luethje" <jluethje at gmx.de>
>
>> The above mentioned use of "nil" is primarily independent of the problem
>> of uninstanciated variables, and those things shouldn't be mixed up,
>> I think. Using nil for such variables looks easy indeed, but I think it's
>> also easy to genarate a runtime error (as Euphoria currently does), to
>> deal with them. The question is to me, what brings more benefit?


[snipped much text about the usefulness of three-valued logic]

Rom, it isn't necessary to convince me of the usefulness of three-valued
logic in general. I wrote myself in my previous post in this thread:
'I would appreciate it very much, if there were a "3-value-logic"
(false/unknown/true) in Euphoria.'

But that does not necessarily mean, that I also think that using 'nil'
is a good way to deal with uninstanciated variables.

Again: Three-valued logic and uninstanciated variables are different
topics, which shouldn't be mixed up.

Regards,
   Juergen