title: How can I swap two Perl variables without using the third?
body: <p>I want to swap two variables values without using the third variable in Perl, e. g.:</p>
  
  <pre><code>my $first = 10;
  my $second = 20;
  </code></pre>
  
  <p>Please suggest me how we can do this in Perl in a simple way.</p>