>, <b class="type">Sleef_quad</b> <i class="var">x</i> );<br/>
<br/>
<span class="normal">Link with</span> -lsleefquad -ltlfloat.
</p>

<p class="header">Description</p>

<p class="noindent">
  These functions evaluate the arc tangent function of
  ( <i class="var">y</i> / <i class="var">x</i> ).  The quadrant of
  the result is determined according to the signs
  of <i class="var">x</i> and <i class="var">y</i>. The error bound of
  the returned value is 1.0 ULP.
</p>

<hr/>

<p class="funcname"><b id="Sle