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You have:

my %words = {};

You want:

my %words = ();

Or better yet:

my %words;

Essentially in that first line, you're adding an entry to the hash where the key is a reference to an anonymous second hash, and the value is undefined. Because you can't use references as hash keys, the reference is stringified (which looks like a memory location).

In other words, my %words = {}; is basically a shorthand for:

my %words; my $ref_to_anon_hash = {}; $words{ $ref_to_anon_hash } = undef;

In reply to Re: Hash Printing reveals Hash Memory Location by tobyink
in thread Hash Printing reveals Hash Memory Location by perlStuck

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