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<a name="math-library-conversion-functions"></a>
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<a name="math-library-conversion-functions-1"></a>
<h3 class="subsection">D.11.3 <code>math</code> library conversion functions</h3>

<p>The conversion function <code>strtod</code> takes a string representing a
<a name="index-strtod"></a>
floating point number in C format to its representation. This function
is the primary means of creating or initializing floating point
numbers in virtual code. A value of floating point 0.0 is returned if
the string is not valid, but no exception is raised.
</p>
<p>The conversion <code>asprintf</code> is similar to the one by that name in
<a name="index-asprintf"></a>
C, but requires a pair <code>(<var>f</var>,<var>x</var>)</code> as an argument.  The
left side <var>f</var> is a character string containing a C style format
conversion for exactly one double precision floating point number,
such as <code>'%0.4e'</code>, and the parameter <var>x</var> is a floating point
number. The result returned will be a character string expressing the
number in the specified format.
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