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#!/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;
}
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