2 files changed, 49 insertions, 0 deletions
diff --git a/challenge-021/dave-cross/perl5/ch-1.pl b/challenge-021/dave-cross/perl5/ch-1.pl
new file mode 100644
index 0000000000..ff73950dc2
--- /dev/null
+++ b/challenge-021/dave-cross/perl5/ch-1.pl
@@ -0,0 +1,27 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+use feature 'say';
+
+my ($curr, $last) = (1, 0);
+my $iter = 1;
+
+do {
+  # say $iter;
+  $last = $curr;
+  $curr += (1 / ( fact($iter++)));
+} until ($last == $curr);
+
+say $curr;
+
+sub fact {
+  my ($x) = @_;
+
+  my $fact = 1;
+  while ($x) {
+    $fact *= $x--;
+  }
+
+  return $fact;
+}
diff --git a/challenge-021/dave-cross/perl5/ch-2.pl b/challenge-021/dave-cross/perl5/ch-2.pl
new file mode 100644
index 0000000000..e0bd00d094
--- /dev/null
+++ b/challenge-021/dave-cross/perl5/ch-2.pl
@@ -0,0 +1,22 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+use feature 'say';
+
+use URI;
+
+if (!@ARGV) {
+  @ARGV = <DATA>;
+  chomp(@ARGV);
+}
+
+for (@ARGV) {
+  say URI->new($_)->canonical;
+}
+
+__DATA__
+HTTP://www.Example.com/
+http://www.example.com/a%c2%b1b
+http://www.example.com/%7Eusername/
+http://www.example.com:80/bar.html