You'll also need to dereference that reference, inside sub pick_a_card, of course: 

#PICK A CARD
sub pick_a_card {
    my $deckref = shift;
    my $card=pop(@{$deckref});
    return $card;
}

[download]

D Ruth Bavousett

In reply to Re: What I am missing here by druthb
in thread What I am missing here by heatblazer

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