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- <h4 class="subsection">D.11.5 Additional <code>math</code> library notes</h4>
- <p>Floating point exceptions such as division by zero are not
- specifically reported as exceptions, but invalid computations can be
- <a name="index-nan-777"></a>detected by the propagation of <code>nan</code> into the result, following
- standard conventions.
- <p>The C function <code>feclearexcept (FE_ALL_EXCEPT)</code> is called before
- <a name="index-feclearexcept-778"></a>every floating point operation so that no lingering exception flags
- can affect it.
- <p>There is no library predicate for exact comparison of floating point
- numbers, but none is required because the virtual machine's
- <code>compare</code> combinator will work on their representations as it
- <a name="index-compare-combinator-779"></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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