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<a name="Typedef-and-constants"></a>
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Next: <a href="Math-Library-Routines.html#Math-Library-Routines" accesskey="n" rel="next">Math Library Routines</a>, Previous: <a href="index.html#Top" accesskey="p" rel="prev">Top</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>]</p>
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<a name="Typedef-and-constants-1"></a>
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<h2 class="chapter">1 Typedef and constants</h2>
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<p>The following data type has been defined via <code>typedef</code>.
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</p>
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<dl compact="compact">
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<dt><code>__complex128</code>: <code>__float128</code>-based complex number</dt>
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</dl>
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<p>The following macros are defined, which give the numeric limits of the
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<code>__float128</code> data type.
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</p>
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<dl compact="compact">
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<dt><code>FLT128_MAX</code>: largest finite number</dt>
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<dt><code>FLT128_MIN</code>: smallest positive number with full precision</dt>
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<dt><code>FLT128_EPSILON</code>: difference between 1 and the next larger</dt>
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<dd><p>representable number
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</p></dd>
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<dt><code>FLT128_DENORM_MIN</code>: smallest positive denormalized number</dt>
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<dt><code>FLT128_MANT_DIG</code>: number of digits in the mantissa (bit precision)</dt>
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<dt><code>FLT128_MIN_EXP</code>: maximal negative exponent</dt>
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<dt><code>FLT128_MAX_EXP</code>: maximal positive exponent</dt>
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<dt><code>FLT128_DIG</code>: number of decimal digits in the mantissa</dt>
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<dt><code>FLT128_MIN_10_EXP</code>: maximal negative decimal exponent</dt>
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<dt><code>FLT128_MAX_10_EXP</code>: maximal positive decimal exponent</dt>
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</dl>
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<p>The following mathematical constants of type <code>__float128</code> are defined.
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</p>
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<dl compact="compact">
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<dt><code>M_Eq</code>: the constant e (Euler’s number)</dt>
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<dt><code>M_LOG2Eq</code>: binary logarithm of 2</dt>
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<dt><code>M_LOG10Eq</code>: common, decimal logarithm of 2</dt>
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<dt><code>M_LN2q</code>: natural logarithm of 2</dt>
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<dt><code>M_LN10q</code>: natural logarithm of 10</dt>
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<dt><code>M_PIq</code>: pi</dt>
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<dt><code>M_PI_2q</code>: pi divided by two</dt>
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<dt><code>M_PI_4q</code>: pi divided by four</dt>
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<dt><code>M_1_PIq</code>: one over pi</dt>
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<dt><code>M_2_PIq</code>: one over two pi</dt>
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<dt><code>M_2_SQRTPIq</code>: two over square root of pi</dt>
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<dt><code>M_SQRT2q</code>: square root of 2</dt>
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<dt><code>M_SQRT1_2q</code>: one over square root of 2</dt>
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</dl>
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