An arguably cleverer way to write the nested loop without using some kind of module:
use strict;
use warnings;
my $year = @ARGV ? shift : 2006;
my $ops = '{-,+,x,/,}';
my $globpat = '{-,}' . (join $ops, (reverse 1..9));
print $globpat, "\n";
for (glob $globpat) {
tr/x/*/;
print "$_ == $year\n" if $year == eval;
}
Caution: Contents may have been coded under pressure.
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