ss="special">);</span>   <span class="comment">// also calls the long double version.</span>
<span class="identifier">acosh</span><span class="special">(</span><span class="number">2</span><span class="special">);</span>      <span class="comment">// integer argument is treated as a double, returns double.</span>
</pre>
<h5>
<a name="math_toolkit.c99.h1"></a>
      <span class="phrase"><a name="math_toolkit.c99.quick_reference"></a></span><a class="link" href="c99.html#math_toolkit.c99.quick_reference">Quic