The weekly challenge 332 - Task 1: Binary Date

 1 #!/usr/bin/env perl
 2 # https://theweeklychallenge.org/blog/perl-weekly-challenge-332/#TASK1
 3 #
 4 # Task 1: Binary Date
 5 # ===================
 6 #
 7 # You are given a date in the format YYYY-MM-DD.
 8 #
 9 # Write a script to convert it into binary date.
10 #
11 # Example 1
12 #
13 # Input: $date = "2025-07-26"
14 # Output: "11111101001-111-11010"
15 #
16 #
17 # Example 2
18 #
19 # Input: $date = "2000-02-02"
20 # Output: "11111010000-10-10"
21 #
22 #
23 # Example 3
24 #
25 # Input: $date = "2024-12-31"
26 # Output: "11111101000-1100-11111"
27 #
28 ############################################################
29 ##
30 ## discussion
31 ##
32 ############################################################
33 #
34 # We split the date into its single parts, then we create the
35 # binary representation for all of those and put them together
36 # again in the end.
37 # To turn a number into its binary representation, we just check
38 # wether it is even or not so we know whether the last digit will
39 # be a "1" or a "0", and append that to the binary representation
40 # of the integer value of the number divided by 2. Of course we
41 # return an empty string in case of an input of "0" to stop
42 # processing.
43 
44 use v5.36;
45 
46 binary_date("2025-07-26");
47 binary_date("2000-02-02");
48 binary_date("2024-12-31");
49 
50 
51 sub binary_date($date) {
52     say "Input: \"$date\"";
53     my @numbers = split /-/, $date;
54     my @binary_numbers = ();
55     foreach my $num (@numbers) {
56         push @binary_numbers, binary($num);
57     }
58     my $binary_date = join("-", @binary_numbers);
59     say "Output: \"$binary_date\"";
60 }
61 
62 sub binary($decimal) {
63     if($decimal > 0) {
64         if($decimal % 2) {
65             return binary(int($decimal/2)) . "1";
66         } else {
67             return binary(int($decimal/2)) . "0";
68         }
69     }
70     return "";
71 }
72