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  1. or download this
    use strict;
use warnings;
...
warn sprintf 'array is%s defined', defined $array ? '' : ' not';
warn         '$#$array is ',             $#$array;
warn sprintf 'array is%s defined', defined $array ? '' : ' not';
  2. or download this
    13:28 >perl 1999_SoPW.pl
array is not defined at 1999_SoPW.pl line 7.
Can't use an undefined value as an ARRAY reference at 1999_SoPW.pl lin
+e 8.

13:28 >