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From: Martijn Lievaart on 24 Apr 2008 18:31
On Thu, 24 Apr 2008 14:10:08 +0000, Ben Bullock wrote:

> Ted <r.ted.byers(a)rogers.com> wrote:
>
>>> Try running the following script to clarify what this means:
>>>
>>> #!/usr/bin/perl
>>> use warnings;
>>> use strict;
>>> my $a;
>>> my $b = "";
>>> print "a is defined\n" if defined($a); print "b is defined\n" if
>>> defined($b);
>>>
>>> Here $b is a "real null string" and $a is undefined.
>
> Excuse me, this should say '$b is a "defined null string"' not "real".

No, $b is an empty string. Certainly not a null string. There is no such
thing as a null string in perl. C++ has a null string concept IIRC, but
Java and C don't, they allow the variable to be set to NULL, which in
perl is setting it to undef.

M4
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