es <code>real</code> and <code>real</code>. The arguments are named <code>mu</code>
and <code>sigma</code>, but that is not part of the declaration.</p>
<div id="function-overloading" class="section level3" number="9.2.1">
<h3><span class="header-section-number">9.2.1</span> Function overloading</h3>
<p>Multiple user-defined functions may have the same name if they have
different sequences of <a href="argument-types-and-qualifiers.html#argument-types-and-qualifiers">argument types</a>.
This is known as func