uteroutput"><span class="keyword">double</span></code>, attribute
                      is mandatory (otherwise compilation will fail)
                    </p>
                  </td>
</tr>
<tr>
<td>
                    <p>
                      <code class="computeroutput"><span class="identifier">double_</span><span class="special">(</span><span class="identifier">num</span><span class="special">)</span></code>
                    </p>
                  </td>
<td>
                    <p>
                 