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<p><code class="code">sign_bit&nbsp;x</code> is <code class="code"><span class="keyword">true</span></code> iff the sign bit of <code class="code">x</code> is set.
    For example <code class="code">sign_bit&nbsp;1.</code> and <code class="code">signbit&nbsp;0.</code> are <code class="code"><span class="keyword">false</span></code> while
    <code class="code">sign_bit&nbsp;(-1.)</code> and <code class="code">sign_bit&nbsp;(-0.)</code> are <code class="co