This is my code to make the program independent of the number of digits.
I donīt know how to interprete 999 and 99, maybe 10^3-1 and 10^2-1, but I don't know how would be if digits is "6".
999 and 999?
99 and 9999?

Regards
Hopes

#!/usr/bin/perl -w
use strict;

my $fr;
my $low_count;
my $digits=5;

for my $x (10 .. 99) {
  for my $y (101 .. 999) {
    my $result = $x * $y;
    if ($result < 10**($digits-1)) {
      $low_count++;
      next;
    }
    my $index;
    $fr->[5-$index++][$&]++ while ($result =~ /\d/g);
  }
}

$fr->[$digits-1][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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