What is the difference between `void f1(const Class &c)` and `void f2(Class const &c)`?
<p>Assume there is a class that named: <code>Class</code>.</p>

<p>What is the difference between these below functions ( Look at keyword <code>const</code> ) ?</p>

<p><code>void f1(const Class &amp;c)</code> and <code>void f2(Class const &amp;c)</code></p>
