Hi Monks I have written this program to add the values of the hash for each of the unique keys like A,B,C.The problem is now I want to find the average of A,B,C,D which are 11.5,15.5,17,18.For this I assume I need to keep the count of the keys.How do I do it? 
DATA:
A,10
A,11
A,12
A,13
B,15
B,16
C,17
D,18

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#!/usr/bin/perl

use strict;
use Data::Dumper;
open DATA,"read";
my %sum;
while (<DATA>) {
    next if ( /^ID/ || /^\s$/ );
    my ($id, $value) = split( "," );
    $sum{$id} = $sum{$id} + $value;
    
}

print Dumper \%sum;

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output:
$VAR1 = {
          'A' => 46,
          'D' => '18',
          'C' => '17',
          'B' => 31
        };

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In reply to get the average of hash values? by luckysing

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