I have some questions about the following code: 
#!/usr/bin/perl -w
use strict;

my @fr = ([], [], [], [], []);
my $low_count;

for my $x (10 .. 99) {
  for my $y (101 .. 999) {
    my $result = $x * $y;
    if ($result < 10000) {
      $low_count++;
      next;
    }
    $result =~ m/(\d)?(\d)?(\d)?(\d)?(\d)?/;
    $fr[0][$5]++;
    $fr[1][$4]++;
    $fr[2][$3]++;
    $fr[3][$2]++;
    $fr[4][$1]++;
  }
}

$fr[4][0] = 0; #This line 

print "$low_count\n\n";

for my $digit (0 .. 9) {
  print "$digit\t";
  for my $exp (reverse 0 .. 4) {
    print "$fr[$exp][$digit]\t";
  }
  print "\n";
}

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1. Is there a better way to write it, that would enable it to be scaled up to multiplcations of any size?

2. Is there a way to prevent a 'use of uninitialised value' error other than explicitly setting the variable like I have done in the line marked '#This line' (which I think is kludgy)?

3. Can you tell from the code what my editor of choice is? :-)

In reply to Frequency analysis of the digits of the result of a multiplication by perlmoth

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