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+#!/bin/perl
+
+=pod
+
+The Weekly Challenge - 192
+ - https://theweeklychallenge.org/blog/perl-weekly-challenge-192/#TASK1
+
+Author: Niels 'PerlBoy' van Dijke
+
+Task 1: Binary Flip
+Submitted by: Mohammad S Anwar
+
+You are given a positive integer, $n.
+
+Write a script to find the binary flip.
+
+=cut
+
+use v5.16;
+use warnings;
+
+use Test::More;
+use Benchmark qw(:all);
+
+
+sub binaryFlipString ($) {
+  my $n = sprintf('%b',$_[0]);
+  $n =~ tr/01/10/;
+  return oct('0b'.$n);
+}
+
+sub binaryFlipBinary ($) {
+  my ($i,$m) = ($_[0],0);
+  # Create bitmask for 'AND' below
+  while ($i) {
+    $i >>= 1; $m = ($m << 1) + 1;
+  }
+  return ~$_[0] & $m;
+}
+  
+
+is(binaryFlipString(5),2);
+is(binaryFlipString(5),2);
+is(binaryFlipString(4),3);
+is(binaryFlipString(6),1);
+is(binaryFlipString(0b10101),0b1010);
+
+is(binaryFlipBinary(5),2);
+is(binaryFlipBinary(5),2);
+is(binaryFlipBinary(4),3);
+is(binaryFlipBinary(6),1);
+is(binaryFlipBinary(0b10101),0b1010);
+
+done_testing;
+
+cmpthese(1_000_000, {
+  'Binary' => sub{binaryFlipBinary(12345678)},
+  'String' => sub{binaryFlipString(12345678)},
+});