#! perl
use warnings;
use strict;

my %hash = (1 => 8, 2 => 6, 3 => 3, 4 => 7);
my $highest_value;
my $highest_key;

while (my ($key, $value) = each %hash)
{
    print "$key key has value $value\n";

    if (!defined $highest_value || $highest_value < $value)
    {
        $highest_key   = $key;
        $highest_value = $value;
    }
}

print "The element with key $highest_key " .
      "has the highest value $highest_value\n" if defined $highest_key;

##</code><code>##

12:36 >perl 591_SoPW.pl
4 key has value 7
1 key has value 8
3 key has value 3
2 key has value 6
The element with key 1 has the highest value 8

12:38 >

##</code><code>##

if (!defined $highest_value || $highest_value lt $value)