From: activeperl-bounces@[...].com
[mailto:activeperl-bounces@[...].com] On Behalf Of
Bernard Hill
Sent: 06 May 2008 15:08
To: activeperl@[...].com
Subject: Basic PERL Script

>  Good morning, All. 

Good afternoon :-) (this is an international forum).

>  
>  Not sure if this list supports basic questions, but I'll pose the
query to find out. 

Shouldn't be a problem.

>  
>  I am new to PERL and working on an basic PERL script. The script will
import values into an array. when 
>  complete, I want to do a calculation based on two feilds and drop the
answer into the third field. Basically I >  have the following script,
but keep getting a syntax error and can't figure out where I've gone
wrong: 
>  
>  sub { 
>  $output = ''; 
>  
>  chomp $_[0]; 
>  $delim = $_[1]; 
>  @input_fields = split /$delim/, $_[0]; 
>  
>  # input the values into the array 
>  for($i=0; $i<$#input_fields; $i++) { 
>  if i$ == 2 
>  { 
>  # perform the calculation 
>  $input_fields[$i] = $input_fields[$i-1] * $input_fields[$i-2]; 
>  } 
>  output = $output . $input_fields[$i] . $delim; 
>  } 
>  
>  $output = $output . $input_fields[$#input_fields] . "\n"; 
>  return($output); 
>  } 
>  
>  Any help is grealy appreciated!

You seem to defining an anonymous subroutine that is not assigned to
anything. It is hard to see how that could ever be called.

Your code would be easier to understand if you indented it
appropriately, and posted in plain text rather than html. It is also
better to cut & paste code, rather than typing it by hand, which I am
guessing you did. Also, a short, self contained script, that we can
simply copy and run, is better that posting a code extract.

If I understand your intention correctly, you seem to be going to a lot
of trouble for something that is relatively simple in Perl (note not
PERL, 'perldoc -q "perl.*Perl"'). 

For example:

------------------------------------------
use strict;
use warnings;

sub do_stuff {
    my $data = shift;
    my $delim = shift;

    chomp $data;
    my @input_fields = split /$delim/, $data;
    $input_fields[2] = $input_fields[1] * $input_fields[0];
    return join($delim, @input_fields);
}

my $result = do_stuff("2,3", ",");
print "Result: '$result'\n";
------------------------------------------

HTH

-- 
Brian Raven 

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