de>, and a positive integer
   if <code class="code">x</code> is greater than <code class="code">y</code>.  The ordering implemented by <code class="code">compare</code>
   is compatible with the comparison predicates <code class="code">=</code>, <code class="code">&lt;</code> and <code class="code">&gt;</code>
   defined above,  with one difference on the treatment of the float value
   <a href="Pervasives.html#VALnan"><code class="code">nan</code></a>.  Namely, the comparison predicates treat <code class=