NEW Q::Now I want to refer to one of the values to do sth with it. E.G. Add a new transaction '-37' to member 'Feynman'. How can I do this? I tried sth like this 
my $account_hash = $accounts->{78};

foreach my $transactions ($account_hash){
    
        push @{ $account_hash{ transactions } }, '-42.37';
    }

print Dumper $account_hash{ transactions };

[download]
Hi guys, I have a data file like this
A,01,Newton,Issac,Physics, 5.6      
B,144.56                            
B,1034.65                           
B,12.23                             
A,34,Einstein,Albert,Physics,12.22  
B,2346.89                           
B,876.23                            
B,7656.81                           
B,745.21                            
B,25.63                             
B,89.56                             
B,7789.23

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This is multiple record data with the definition of the record types being:
Record type A: Type,member number,Surname,Firstname,Job,Balance
Record type B: Type,TransactionAmount
Write a program to: Read the data from the file and populate a data structure that looks like this: 
%accounts = ( 
’78’ => { 
’surname’ => ’Feynman’, 
’firstname’ => ’Richard’, 
’job’ => ’Physics’, 
’balance’ => -17.34, 
’transactions => [ 7412.36, 2589.35, 95.32, 12.85, 789.68 ], 
}, 
’89’ => { 
’surname’ => ’Merx’, 
... 
},

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I have writen code to read the data in diff arrays but I dont know how to use the 'member number' as the key and also add the transationAmount from 2nd array to the addtional field of the 1st array. 
use strict;
use warnings;
use Data::Dumper;
use Fatal qw/ open close / ;

my $data = "accounts.txt";

open (DAT, $data) or die "\"$data\" not existed or can't be opened!\n"
+;
my @accounts;  
my @transactionamount;
my @fields1 = (
     'Type',
    'member number', 
    'Surname',
    'Firstname',
    'Job', 
    'Balance',
    );
my @fields2 = qw/Type TransactionAmount/;
my $fields1;
my $fields2;
my $values;
while (<DAT>) {
    chomp;
    my @values = split(/,/);
    my %entry = map { $fields1[$_] => $values[$_] } ( 0..$#fields1 );
    #print Dumper %entry;
    
    if ($entry{"Type"} eq 'B'){
        my %transactionamount = map { $fields2[$_] => $values[$_] } ( 
+0..$#fields2 );
    push @transactionamount, \%transactionamount;
  }
      else {
        push @accounts, \%entry;
}
}
print Dumper @transactionamount;

[download]

In reply to read multiple record data and populate in a new data stucture by fseng

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