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  58. <h3 class="subsection">D.11.5 Additional <code>math</code> library notes</h3>
  59. <p>Floating point exceptions such as division by zero are not
  60. specifically reported as exceptions, but invalid computations can be
  61. <a name="index-nan"></a>
  62. detected by the propagation of <code>nan</code> into the result, following
  63. standard conventions.
  64. </p>
  65. <p>The C function <code>feclearexcept (FE_ALL_EXCEPT)</code> is called before
  66. <a name="index-feclearexcept"></a>
  67. every floating point operation so that no lingering exception flags
  68. can affect it.
  69. </p>
  70. <p>There is no library predicate for exact comparison of floating point
  71. numbers, but none is required because the virtual machine&rsquo;s
  72. <code>compare</code> combinator will work on their representations as it
  73. <a name="index-compare-combinator"></a>
  74. will on any other data. The usual caveats apply with regard to
  75. comparing floating point numbers in the presence of roundoff error.
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