3 files changed, 64 insertions, 0 deletions
diff --git a/challenge-098/dave-cross/perl/ch-1.pl b/challenge-098/dave-cross/perl/ch-1.pl
new file mode 100644
index 0000000000..b5dc6933da
--- /dev/null
+++ b/challenge-098/dave-cross/perl/ch-1.pl
@@ -0,0 +1,21 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+use feature qw[signatures say state];
+no warnings 'experimental::signatures';
+
+say readN('input.txt', 4) for 1 .. 3;
+
+sub readN ($filename, $n) {
+  state %fh;
+
+  unless ($fh{$filename}) {
+    open $fh{$filename}, '<', $filename
+      or die "Cannot open '$filename': $!\n";
+  }
+
+  read $fh{$filename}, my ($buf), $n;
+
+  return $buf;
+}
diff --git a/challenge-098/dave-cross/perl/ch-2.pl b/challenge-098/dave-cross/perl/ch-2.pl
new file mode 100644
index 0000000000..2848332d15
--- /dev/null
+++ b/challenge-098/dave-cross/perl/ch-2.pl
@@ -0,0 +1,42 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+use feature qw[say signatures];
+no warnings 'experimental::signatures';
+
+use Test::More;
+
+my @tests = ({
+  array => [1, 2, 3, 4],
+  n     => 3,
+  exp   => 2,
+}, {
+  array => [1, 3, 5, 7],
+  n     => 6,
+  exp   => 3,
+}, {
+  array => [12, 14, 16, 18],
+  n     => 10,
+  exp   => 0,
+}, {
+  array => [11, 13, 15, 17],
+  n     => 19,
+  exp   => 4,
+});
+
+for (@tests) {
+  is get_index($_->{array}, $_->{n}), $_->{exp};
+}
+
+done_testing;
+
+sub get_index {
+  my ($arr, $n) = @_;
+
+  for (0 .. $#$arr) {
+    return $_ if $arr->[$_] >= $n;
+  }
+
+  return scalar @$arr;
+}
diff --git a/challenge-098/dave-cross/perl/input.txt b/challenge-098/dave-cross/perl/input.txt
new file mode 100644
index 0000000000..a32a4347a4
--- /dev/null
+++ b/challenge-098/dave-cross/perl/input.txt
@@ -0,0 +1 @@
+1234567890