Hello Dear Monks

I am usin a hash reference in my program but I made a mistake. Could you check ? Thanks. I just wrote the parts where the problem lies. I have not written what has been tested.

I have updated the code with bits I found important to write 

sub flow_count{
    
    my $HASH_OF_FLOW;
    my $view = $_[0]; # FTFM or CTFM

        ...
        ...
        foreach my $file(@FILES_IN_THE_FOLDER){
           my $key = "$reg;$date";
           # M2 is a number which has been computed
       $HASH_OF_FLOW->{'$key'} = 'M2';
        }

     return $HASH_OF_FLOW; 
}

my $FTFM_HASH_OF_FLOW = flow_count("FTFM");
my $CTFM_HASH_OF_FLOW = flow_count("CTFM");
my @FTFM_KEYS = keys %$FTFM_HASH_OF_FLOW;


foreach my $key(@FTFM_KEYS){
    my $FTFM_CTFM_diff = $FTFM_HASH_OF_FLOW{$key} - $CTFM_HASH_OF_FLOW
+{$key};
    print $OUTFILE "$key;$FTFM_HASH_OF_FLOW{$key};$CTFM_HASH_OF_FLOW{$
+key};$FTFM_CTFM_diff\n";
}

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In reply to reference of hash by steph_bow

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