Dear Monks,

Please look at the following code

use strict;
use warnings;
use Data::Dumper;

open (S,"<","sample.data") or die $!;

my @file=<S>;
my %samplehash;
my @fields;
my ($key,$subkey);
for ( my $i=0;$i<=$#file;$i++)
{
    chomp $file[$i];
    @fields=split /\s+/,$file[$i];
    $samplehash{$fields[1]}{$fields[2]}=$fields[0];
}

foreach $key (keys %samplehash)
{
    print "\n $key = ". $samplehash{$key};
    
    foreach $subkey (keys %{$samplehash{$key}})
    {
       print "\t$subkey = $samplehash{$key}{$subkey} ";
    }
}
close S;

[download]

This is the input file

cow        NM_178575.2        0
cow        NM_181451.1        1
cow        NM_001038581.1        2
cow        NM_001037618.1        3
cow        NM_001034757.1        4
cow        NM_001076304.1        5
cow        NM_001076305.1        6
cow        NM_001076273.1        7
cow        NM_001076486.1        8
cow        NM_001076951.1        9
cow        NM_001077070.1        10
cow        NM_001077006.1        11
cow        NM_001078104.1        12
cow        NM_001078077.1        13
cow        NM_001077830.1        14
cow        NM_001079784.1        15
cow        NM_001078135.1        16
cow        NM_001080323.1        17
cow        NM_001080346.1        18
cow        NM_001080347.1        19
cow        NM_174222.2        20
cow        NM_001080364.1        21

[download]

When i try to print the key of the first hash table, using print "\n $key = ". $samplehash{$key};, i see the output something very weird as follows :

 NM_001077006.1 = HASH(0x224be2c)       11 = cow

[download]

Can someone tell me the problem with my print statement, please. I didn't understand what is the HASH(0x224be2c) ,when i am expecting it to print 11

In reply to Print the key of the first hash table in hash of hashes by sundeep

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