From 0949e4f44fa8b435ae4b54c6bfb0fee3813b9481 Mon Sep 17 00:00:00 2001
From: Lubos Kolouch <lubos@kolouch.net>
Date: Sat, 17 Jul 2021 12:43:34 +0200
Subject: Challenge 121 Task 1 LK Perl Python

---
 challenge-121/lubos-kolouch/perl/ch-1.pl   | 34 ++++++++++++++++++++++++++++++
 challenge-121/lubos-kolouch/python/ch-1.py | 20 ++++++++++++++++++
 2 files changed, 54 insertions(+)
 create mode 100644 challenge-121/lubos-kolouch/perl/ch-1.pl
 create mode 100644 challenge-121/lubos-kolouch/python/ch-1.py

diff --git a/challenge-121/lubos-kolouch/perl/ch-1.pl b/challenge-121/lubos-kolouch/perl/ch-1.pl
new file mode 100644
index 0000000000..b7c4d9a014
--- /dev/null
+++ b/challenge-121/lubos-kolouch/perl/ch-1.pl
@@ -0,0 +1,34 @@
+#!/usr/bin/perl 
+#===============================================================================
+#  DESCRIPTION: Perl Weekly Challenge #121
+#               Task 1 -Invert Bit
+#
+#       AUTHOR: Lubos Kolouch
+#      CREATED: 20210717 04:44:33 PM
+#===============================================================================
+
+use strict;
+use warnings;
+use Data::Dumper;
+
+sub bin2dec {
+    # shamelessly copied from The Perl Cookbook
+    return unpack("N", pack("B32", substr("0" x 32 . shift, -32)));
+}
+
+sub invert_bit{
+    my ($what, $n) = @_;
+
+    my $binary_what = sprintf ("%b",$what);
+    my @binary_arr = split //, $binary_what;
+    $binary_arr[-$n] = $binary_arr[-$n] ? 0 : 1;
+    return bin2dec(join "", @binary_arr);
+}
+
+use Test::More;
+
+is(invert_bit((12, 3)), 8);
+is(invert_bit((18, 4)), 26);
+
+done_testing;
+
diff --git a/challenge-121/lubos-kolouch/python/ch-1.py b/challenge-121/lubos-kolouch/python/ch-1.py
new file mode 100644
index 0000000000..0e41d3a501
--- /dev/null
+++ b/challenge-121/lubos-kolouch/python/ch-1.py
@@ -0,0 +1,20 @@
+# ===============================================================================
+#  DESCRIPTION: Perl Weekly Challenge #121
+#               Task 1 - Invert bit
+#
+#       AUTHOR: Lubos Kolouch
+#      CREATED: 20210710 04:44:33 PM
+# ===============================================================================
+
+
+def invert_bit(what: int, n: int):
+
+    binary_what = str(bin(what)[2:])
+
+    binary_arr = list(binary_what)
+    binary_arr[-n] = '0' if binary_arr[-n] == '1' else '1'
+    return int("".join(binary_arr), 2)
+
+
+assert invert_bit(12, 3) == 8
+assert invert_bit(18, 4) == 26
-- 
cgit