   numbers.
        </p>
<pre class="programlisting"><span class="identifier">double_</span> <span class="special">&gt;&gt;</span> <span class="identifier">double_</span>
</pre>
<p>
          Here you see the familiar floating-point numeric parser <code class="computeroutput"><span class="identifier">double_</span></code>
          used twice, once for each number. What's that <code class="computeroutput"><span class="special">&gt;&gt;</span></code>
          operator doing in there? Well, they had to be se