> -----Original Message-----
> From: Zachary Shay [mailto:[EMAIL PROTECTED]
> Sent: Monday, September 24, 2007 11:04
> To: beginners@perl.org
> Subject: How to test for "0"
>
> Is there a way to test for values where zero is valid?
>
> For instance:
>
> %a_Hash;
> $a_hash{"user_id"} = 0;
> $a_hash{"user_name"} = "root" if ($a_hash{"user_id"});
>
> print $a_hash{"user_id"} if ($a_hash{"user_id"});
> print $a_hash{"user_name"} if ($a_hash{"user_name"});
>
> Sometimes the user_id can be undef. As a result, if there is
> no user_id...I
> don't concern myself with trying to assign a user_name. The
> problem is that
> I believe the zero is being interpreted as false. Is there a
In Perl zero is false and non zero is true. You can try:
if ( exists $a_hash{"user_id"} ) {
# place what you want to do if the particular user_id
does exist
}
A thought.
Wags ;)
David R Wagner
Senior Programmer Analyst
FedEx Freight
1.408.323.4225x2224 TEL
1.408.323.4449 FAX
http://fedex.com/us
> way to test
> these values so that only undef will return as false?
>
> Thanks,
> Zach
>
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