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<a name="math-library-exceptions"></a>
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<a name="math-library-exceptions-1"></a>
<h3 class="subsection">D.11.4 <code>math</code> library exceptions</h3>

<p>The most likely cause of an exception is an attempt to apply a
<code>math</code> library function to <code>nil</code> or to an argument that
doesn&rsquo;t represent a floating point number. In these cases, an error
<a name="index-missing-value-2"></a>
<a name="index-invalid-value-2"></a>
message of <code>&lt;'missing value'&gt;</code> or <code>&lt;'invalid value'&gt;</code> will
be the result.
</p>
<p>An error message of <code>&lt;'invalid asprintf() specifier'&gt;</code> is
<a name="index-invalid-asprintf-specifier"></a>
reported by the <code>asprintf</code> function if the format specifier
<a name="index-asprintf-1"></a>
pertains to a string, such as <code>'%s'</code>. This error is specifically
trapped because the alternative would be a segmentation
<a name="index-segmentation-fault-9"></a>
fault. Otherwise, invalid format specifiers are not detected or
reported.
</p>
<p>Error messages of <code>&lt;'invalid text format'&gt;</code> can be generated
<a name="index-invalid-text-format-3"></a>
by conversion functions if any parameters that are meant to be
character string representations are something else.
</p>
<p>There is always a chance of a <code>&lt;'memory overflow'&gt;</code> error if
there is insufficient memory to allocate a result.
</p>
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