pects the number to generate. Thus, if we were to attach a function
          <code class="computeroutput"><span class="identifier">F</span></code> to <code class="computeroutput"><span class="identifier">double_</span></code>,
          we need <code class="computeroutput"><span class="identifier">F</span></code> to be declared
          as:
        </p>
<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">F</span><span class="special">(</span><span class="keyword">double<