Solution to task 1

1 files changed, 62 insertions, 0 deletions

diff --git a/challenge-258/jo-37/perl/ch-1.pl b/challenge-258/jo-37/perl/ch-1.pl
new file mode 100755
index 0000000000..510091a56d
--- /dev/null
+++ b/challenge-258/jo-37/perl/ch-1.pl
@@ -0,0 +1,62 @@
+#!/usr/bin/perl -s
+
+use v5.24;
+use Test2::V0;
+use Math::Prime::Util 'todigits';
+
+our ($tests, $examples, $base);
+$base ||= 10;
+
+run_tests() if $tests || $examples;	# does not return
+
+die <<EOS unless @ARGV;
+usage: $0 [-examples] [-tests] [-base=BASE] [N...]
+
+-examples
+    run the examples from the challenge
+ 
+-tests
+    run some tests
+
+-verbose
+    enable trace output
+
+-base=BASE
+    regard numbers in base BASE. Default: 10
+
+N...
+    list of numbers
+
+EOS
+
+
+### Input and Output
+
+say cedn($base, @ARGV);
+
+
+### Implementation
+
+sub cedn {
+    my $base = shift;
+	scalar grep !(scalar(todigits($_, $base)) % 2), @_
+}
+
+
+### Examples and tests
+
+sub run_tests {
+    SKIP: {
+        skip "examples" unless $examples;
+
+        is cedn(10 => 10, 1, 111, 24, 1000), 3, 'example 1';
+        is cedn(10 => 111, 1, 11111), 0, 'example 2';
+    }
+
+    SKIP: {
+        skip "tests" unless $tests;
+	}
+
+    done_testing;
+    exit;
+}