cpp::NumericVector</code>)</p></li>
<li><p><code>RETURN_TYPE FUNCTION_NAME(ARGUMENT_TYPE ARGUMENT){}</code>：You need to specify data types of functions and arguments.</p></li>
<li><p><code>return RETURN_VALUE;</code>：<code>return</code> statement is mandatory if your function would return a value. However, if your function do not return a value (i.e. <code>RETURN_TYPE</code> is <code>void</code>), the return statement can be omitted.</p></li>
</ul>
</div>
</div>
<div id="compiling-the-code" class="sect