rogram, you could add a test case that uses <code class="language-c++ highlighter-rouge"><span class="n">EXPECT</span></code> to confirm the correct result from <code class="language-c++ highlighter-rouge"><span class="n">isPalindrome</span></code>, as shown below.</p>

<div class="language-c++ highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="c1">// reversed(str) returns copy of str with characters in reverse order.</span>
<span class="n">string</span> <span class="nf">rev