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+<h2>9. Palindrome Number</h2><h3>Easy</h3><hr><div><p>Given an integer <code>x</code>, return <code>true</code> if <code>x</code> is palindrome integer.</p>
+
+<p>An integer is a <strong>palindrome</strong> when it reads the same backward as forward.</p>
+
+<ul>
+	<li>For example, <code>121</code> is a palindrome while <code>123</code> is not.</li>
+</ul>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+
+<pre><strong>Input:</strong> x = 121
+<strong>Output:</strong> true
+<strong>Explanation:</strong> 121 reads as 121 from left to right and from right to left.
+</pre>
+
+<p><strong>Example 2:</strong></p>
+
+<pre><strong>Input:</strong> x = -121
+<strong>Output:</strong> false
+<strong>Explanation:</strong> From left to right, it reads -121. From right to left, it becomes 121-. Therefore it is not a palindrome.
+</pre>
+
+<p><strong>Example 3:</strong></p>
+
+<pre><strong>Input:</strong> x = 10
+<strong>Output:</strong> false
+<strong>Explanation:</strong> Reads 01 from right to left. Therefore it is not a palindrome.
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>-2<sup>31</sup>&nbsp;&lt;= x &lt;= 2<sup>31</sup>&nbsp;- 1</code></li>
+</ul>
+
+<p>&nbsp;</p>
+<strong>Follow up:</strong> Could you solve it without converting the integer to a string?</div>