Wc -Sx- Jones wrote:
> david wrote:
>
>> * You *might* be saying $i is unknown (or undef) because $ENV{something}
>> can be true, or false or neither true nor false which '?:' can't handle.
>> correct?
>
> Undef is a valid condition in Perl Yes or No?
yes but is undef true or false? and when you evaluate undef as a boolean
expression, what possible values can it has? i say:
* 2 possible values: true or false
your previous posts sound like:
* 3 possible values (3-way logic): true or false or neither true nor false
and my very original quesiont is:
show me an expression where it can be evaluated to neither true nor false
david
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