If you pass a hash-ref to your sub, it would look like this: 
&loop_print(\%c);

sub loop_print {
    my $href = shift;
    foreach (keys %{$href}) {
        print "$_: ${$href}{$_}\n";
    }
}

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In reply to Re: How to use pass and return hashes in a subroutine by le
in thread How to use pass and return hashes in a subroutine by chariscomp

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