Where's your code that you have tried?

I'll be nice share some code that should get you started. I'll leave it to you to figure out how to bundle it in a subroutine, how to pass data into and out of it, and any other modifications you need to meet your needs.

use strict;
use warnings;

my (@list) = (1,1,2,3,4,4,4,5,6,7,7,8,9,10);

my %check;

foreach my $item (@list) {
    if (exists $check{$item}) {$check{$item}++;}
    else {$check{$item} = 1;}
}

foreach my $key (keys %check) {
    my $count = $check{$key};
    if ($count > 1) {
        print "$key was in the list $count times.\n";
    }
}

[download]

In reply to Re: list item comparison by dasgar
in thread list item comparison by robertw

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