               <span class="keyword">double</span></code>.
              </li>
<li class="listitem">
                <span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="keyword">true</span></code>
                when <code class="computeroutput"><span class="identifier">x</span></code> is a normal
                number (not zero, subnormal, infinity, or NaN), <code class="computeroutput"><span class="keyword">false</span></code>
                otherwise.
        