too tired to answer directly to the code, but for the last two questions see this code:
use strict;
use warnings;
my @numbers = 4 .. 6;
my $number_of_trailing_zeros = 3;
my $commify_at = 3;
@numbers = map {
$_ .= "0" x $number_of_trailing_zeros;
$_ =~ s/(\d{$commify_at})$/,$1/;
$_;
} @numbers;
print "@numbers";
btw is there a special reason why some write use warnings before use strict?
anyway, HTH ;)
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