0" or "+0" and
          negative zero as "-0". But setting the <code class="computeroutput"><span class="identifier">signed_zero</span></code>
          flag may be more portable.
        </p></td></tr>
</table></div>
<div class="tip"><table border="0" summary="Tip">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Tip]" src="../../../../../../doc/src/images/tip.png"></td>
<th align="left">Tip</th>
</tr>
<tr><td align="left" valign="top"><p>
          A negative zero value can be port