>
<span class="special">}</span>
</pre>
<p>
        The full cpp file for this example can be found here: <a href="../../../../../example/x3/sum.cpp" target="_top">sum.cpp</a>
      </p>
<p>
        This is almost like our original numbers list example. We're incrementally
        building on top of our examples. This time though, like in the complex number
        example, we'll be adding the smarts. There's an accumulator (<code class="computeroutput"><span class="keyword">double</span><span class="specia