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  1. or download this
    use warnings;
my $retval = 0;

warn "Return Value $retval\n";
  2. or download this
    use warnings;
my $retval;

warn "Return Value $retval\n";
  3. or download this
    use warnings;
my $retval;
...
$retval = get_value_from_subroutine();

warn "Return Value $retval\n";