Untested except by running it in the version of Perl installed in my head: 
{
  my $value;
  my $hash_ref;
  my $done;
  sub get_key {
    unless ($done) {
      (my $key, $value) = each %$hash_ref or # yes, $value is out of s
+cope
        $done = 1;
    }
    defined $key ? $key : "";
  }
  sub get_value {
    defined $value ? $value : "";
  }
  sub set_hash {
    $hash_ref = shift;
    keys %$hash_ref; # reset each()
    $done = 0;
  }
}

set_hash(\%hash_you_want_to_scan);
write STDOUT;

format STDOUT =
@>>>>> @###     @>>>>> @### ~~
get_key(), get_value(), get_key(), get_value()
.

[download]
Note the use of the repeating format line to execute that value as long as data is available, then stop when it's not.

-- Randal L. Schwartz, Perl hacker

update: Change that middle subroutine to: 
  sub get_key {
    my $key;
    unless ($done) {
      ($key, $value) = each %$hash_ref or # yes, $value is out of scop
+e
        $done = 1;
    }
    defined $key ? $key : "";
  }

[download]
Too early in the morning for this. {grin}
update 2: Yes, those @#### need to be changed to @<<<< as well. Thanks for actually running the code, jcwren!

In reply to Re: Using formats for 2-columnprinting by merlyn
in thread Using formats for 2-columnprinting by husker

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