Dear Monks,

I have a key-value hash where all keys and values are codes relating to either apples, oranges or lemons. I want to find how many orange-apple, apple-lemon and lemon-orange pairs i have in the hash. All the codes relating to each fruit group are stored in seperate arrays.

However, I could really use some help on finding the best way to do this. Ideally I would like an output (preferably the same order as is in the hash) stating whether each key & value are apples, oranges or lemons:

e.g.

#e.g.
lemon-lemon
apple-orange
orange-lemon
orange-apple
[download]

Here is my code so far:

my %hash = map { $keys[$_] => $values[$_] } 0.. $#keys;

for (my $i=0; $i<@apple_ids; $i++)  {
        while ( my ($key, $value) = each(%hash) ) {

                if ($apple_ids[$i] == $key) {
                        print "apple";
                }
                if ($apple_ids[$i] == $value)     {
                        print "apple";
                }
        }
}

for (my $i=0; $i<@orange_ids; $i++)  {
        while ( my ($key, $value) = each(%hash) ) {

                if ($orange_ids[$i] == $key) {
                        print "orange";
                }
                if ($orange_ids[$i] == $value)     {
                        print "orange";
                }
        }
}
for (my $i=0; $i<@lemon_ids; $i++)  {
        while ( my ($key, $value) = each(%hash) ) {

                if ($lemon_ids[$i] == $key) {
                        print "lemon";
                }
                if ($lemon_ids[$i] == $value)     {
                        print "lemon";
                }
        }
}
[download]

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