usage.html#cb3-7"></a>    <span class="dt">double</span> sum = <span class="dv">0</span>;</span>
<span id="cb3-8"><a href="030_basic_usage.html#cb3-8"></a>    <span class="cf">for</span>(<span class="dt">int</span> i=<span class="dv">0</span>; i&lt;v.length(); ++i){</span>
<span id="cb3-9"><a href="030_basic_usage.html#cb3-9"></a>        sum += v[i];</span>
<span id="cb3-10"><a href="030_basic_usage.html#cb3-10"></a>    }</span>
<span id="cb3-11"><a href="030_basic_usage.html#cb3-11"></a>    <span class="cf