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<a name="Additional-math-library-notes"></a>
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<a name="Additional-math-library-notes-1"></a>
<h3 class="subsection">D.11.5 Additional <code>math</code> library notes</h3>

<p>Floating point exceptions such as division by zero are not
specifically reported as exceptions, but invalid computations can be
<a name="index-nan"></a>
detected by the propagation of <code>nan</code> into the result, following
standard conventions.
</p>
<p>The C function <code>feclearexcept (FE_ALL_EXCEPT)</code> is called before
<a name="index-feclearexcept"></a>
every floating point operation so that no lingering exception flags
can affect it.
</p>
<p>There is no library predicate for exact comparison of floating point
numbers, but none is required because the virtual machine&rsquo;s
<code>compare</code> combinator will work on their representations as it
<a name="index-compare-combinator"></a>
will on any other data. The usual caveats apply with regard to
comparing floating point numbers in the presence of roundoff error.
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