1 files changed, 61 insertions, 0 deletions
diff --git a/challenge-243/jo-37/perl/ch-2.pl b/challenge-243/jo-37/perl/ch-2.pl
new file mode 100755
index 0000000000..5908f1337f
--- /dev/null
+++ b/challenge-243/jo-37/perl/ch-2.pl
@@ -0,0 +1,61 @@
+#!/usr/bin/perl -s
+
+use Test2::V0 '!float';
+use PDL;
+
+our ($tests, $examples);
+
+run_tests() if $tests || $examples;	# does not return
+
+die <<EOS unless @ARGV;
+usage: $0 [-examples] [-tests] [N...]
+
+-examples
+    run the examples from the challenge
+ 
+-tests
+    run some tests
+
+N...
+    list of positive integers
+
+EOS
+
+
+### Input and Output
+
+say floor_sum(@ARGV);
+
+
+### Implementation
+
+# Sum over floor($nums[$i] / $nums[$j]).
+
+sub floor_sum {
+    my $nums = pdl @_;
+
+    floor($nums / $nums->dummy(0))->sum;
+}
+
+
+### Examples and tests
+
+sub run_tests {
+    SKIP: {
+        skip "examples" unless $examples;
+
+        is floor_sum(2, 5, 9), 10, 'example 1';
+        is floor_sum(7, 7, 7, 7, 7, 7, 7), 49, 'example 2';
+    }
+
+    SKIP: {
+        skip "tests" unless $tests;
+
+        # floor(3 / (-2)) = -2
+        # floor((-2) / 3) = -1
+        is floor_sum(3, -2), -1, 'negative elements';
+	}
+
+    done_testing;
+    exit;
+}