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<p>配对交换。编写程序,交换某个整数的奇数位和偶数位,尽量使用较少的指令(也就是说,位 0 与位 1 交换,位 2 与位 3 交换,以此类推)。</p>
<p><strong>示例 1</strong></p>
<pre>
<strong> 输入</strong>num = 2或者 0b10
<strong> 输出:</strong>1 (或者 0b01)
</pre>
<p><strong>示例 2</strong></p>
<pre>
<strong> 输入</strong>num = 3
<strong> 输出</strong>3
</pre>
<p><strong>提示:</strong></p>
<ol>
<li><code>num</code>&nbsp;的范围在[0, 2<sup>30</sup> - 1]之间,不会发生整数溢出。</li>
</ol>