2 files changed, 54 insertions, 0 deletions
diff --git a/challenge-090/jo-37/perl/ch-1.pl b/challenge-090/jo-37/perl/ch-1.pl
new file mode 100755
index 0000000000..d19e66e524
--- /dev/null
+++ b/challenge-090/jo-37/perl/ch-1.pl
@@ -0,0 +1,26 @@
+#!/usr/bin/perl
+
+use Test2::V0;
+
+# Count nucleotides and generate complement
+sub complement_dna {
+	local $_ = shift;
+
+	# Create the complement (providing the count) and return this as
+	# the final return value.
+	(y/TAGC/ATCG/, $_);
+}
+
+
+is [complement_dna(
+		'GTAAACCCCTTTTCATTTAGACAGATCGACTCCTTATCCATTCTCAGAGATGTGTTGCTGGTCGCCG')],
+	[67, 'CATTTGGGGAAAAGTAAATCTGTCTAGCTGAGGAATAGGTAAGAGTCTCTACACAACGACCAGCGGC'],
+	'count and complement';
+	
+is complement_dna(
+		'GTAAACCCCTTTTCATTTAGACAGATCGACTCCTTATCCATTCTCAGAGATGTGTTGCTGGTCGCCG'),
+	'CATTTGGGGAAAAGTAAATCTGTCTAGCTGAGGAATAGGTAAGAGTCTCTACACAACGACCAGCGGC',
+	'complement only';
+
+
+done_testing;
diff --git a/challenge-090/jo-37/perl/ch-2.pl b/challenge-090/jo-37/perl/ch-2.pl
new file mode 100755
index 0000000000..e1d3865f81
--- /dev/null
+++ b/challenge-090/jo-37/perl/ch-2.pl
@@ -0,0 +1,28 @@
+#!/usr/bin/perl
+
+use integer;
+use Test2::V0;
+
+# Implement Ethiopian multiplication
+sub ethiopian_mult {
+	my ($p, $q) = splice @_, 0, 2;
+	# The method is more effective if the first number is the smaller
+	# one.
+	($p, $q) = ($q, $p) if $p > $q;
+
+	my $prod = 0;
+	while ($p) {
+		# Add second number if the first is odd
+		$prod += ($p % 2) * $q;
+		# Get next pair.
+		($p, $q) = ($p / 2, $q * 2);
+	}
+
+	$prod;
+}
+
+is ethiopian_mult(14, 12), 168, 'Example 1';
+is ethiopian_mult(2**32, 0), 0, 'Multiply by zero';
+is ethiopian_mult(2**32, 1), 2**32, 'Multiply by one';
+
+done_testing;