gative NaN
                </p>
              </td>
<td>
                <p>
                  "-nan" or "-nan(...)"
                </p>
              </td>
</tr>
</tbody>
</table></div>
</div>
<br class="table-break"><p>
        So following C99 provides a sensible 'standard' way of handling input and
        output of nonfinites in C++, and this implementation follows most of these
        formats.
      </p>
<h6>
<a name="math_toolkit.fp_facets.facets_intro.h4"></a>
        <span class="phrase"><a name=