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<!-- This manual documents how to install and use the Multiple Precision
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Floating-Point Reliable Library, version 3.1.4.
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Copyright 1991, 1993-2016 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document under
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<head>
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<title>Miscellaneous Functions (GNU MPFR 3.1.4)</title>
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<meta name="description" content="How to install and use GNU MPFR, a library for reliable multiple precision
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floating-point arithmetic, version 3.1.4.">
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<meta name="keywords" content="Miscellaneous Functions (GNU MPFR 3.1.4)">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="MPFR-Interface.html#MPFR-Interface" rel="up" title="MPFR Interface">
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<link href="Exception-Related-Functions.html#Exception-Related-Functions" rel="next" title="Exception Related Functions">
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<body lang="en">
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<a name="Miscellaneous-Functions"></a>
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<div class="header">
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<p>
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Next: <a href="Exception-Related-Functions.html#Exception-Related-Functions" accesskey="n" rel="next">Exception Related Functions</a>, Previous: <a href="Rounding-Related-Functions.html#Rounding-Related-Functions" accesskey="p" rel="prev">Rounding Related Functions</a>, Up: <a href="MPFR-Interface.html#MPFR-Interface" accesskey="u" rel="up">MPFR Interface</a> [<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="index-Miscellaneous-float-functions"></a>
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<a name="Miscellaneous-Functions-1"></a>
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<h3 class="section">5.12 Miscellaneous Functions</h3>
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<dl>
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<dt><a name="index-mpfr_005fnexttoward"></a>Function: <em>void</em> <strong>mpfr_nexttoward</strong> <em>(mpfr_t <var>x</var>, mpfr_t <var>y</var>)</em></dt>
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<dd><p>If <var>x</var> or <var>y</var> is NaN, set <var>x</var> to NaN. If <var>x</var> and <var>y</var>
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are equal, <var>x</var> is unchanged. Otherwise, if <var>x</var>
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is different from <var>y</var>, replace <var>x</var> by the next floating-point
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number (with the precision of <var>x</var> and the current exponent range)
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in the direction of <var>y</var>
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(the infinite values are seen as the smallest and largest floating-point
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numbers). If the result is zero, it keeps the same sign. No underflow or
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overflow is generated.
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpfr_005fnextabove"></a>Function: <em>void</em> <strong>mpfr_nextabove</strong> <em>(mpfr_t <var>x</var>)</em></dt>
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<dt><a name="index-mpfr_005fnextbelow"></a>Function: <em>void</em> <strong>mpfr_nextbelow</strong> <em>(mpfr_t <var>x</var>)</em></dt>
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<dd><p>Equivalent to <code>mpfr_nexttoward</code> where <var>y</var> is plus infinity
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(resp. minus infinity).
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpfr_005fmin"></a>Function: <em>int</em> <strong>mpfr_min</strong> <em>(mpfr_t <var>rop</var>, mpfr_t <var>op1</var>, mpfr_t <var>op2</var>, mpfr_rnd_t <var>rnd</var>)</em></dt>
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<dt><a name="index-mpfr_005fmax"></a>Function: <em>int</em> <strong>mpfr_max</strong> <em>(mpfr_t <var>rop</var>, mpfr_t <var>op1</var>, mpfr_t <var>op2</var>, mpfr_rnd_t <var>rnd</var>)</em></dt>
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<dd><p>Set <var>rop</var> to the minimum (resp. maximum)
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of <var>op1</var> and <var>op2</var>. If <var>op1</var>
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and <var>op2</var> are both NaN, then <var>rop</var> is set to NaN. If <var>op1</var>
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or <var>op2</var> is NaN, then <var>rop</var> is set to the numeric value. If
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<var>op1</var> and <var>op2</var> are zeros of different signs, then <var>rop</var>
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is set to −0 (resp. +0).
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpfr_005furandomb"></a>Function: <em>int</em> <strong>mpfr_urandomb</strong> <em>(mpfr_t <var>rop</var>, gmp_randstate_t <var>state</var>)</em></dt>
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<dd><p>Generate a uniformly distributed random float in the interval
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<em>0 <= <var>rop</var> < 1</em>. More precisely, the number can be seen as a
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float with a random non-normalized significand and exponent 0, which is then
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normalized (thus if <var>e</var> denotes the exponent after normalization, then
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the least <em>-<var>e</var></em> significant bits of the significand are always 0).
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</p>
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<p>Return 0, unless the exponent is not in the current exponent range, in
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which case <var>rop</var> is set to NaN and a non-zero value is returned (this
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should never happen in practice, except in very specific cases). The
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second argument is a <code>gmp_randstate_t</code> structure which should be
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created using the GMP <code>gmp_randinit</code> function (see the GMP manual).
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</p>
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<p>Note: for a given version of MPFR, the returned value of <var>rop</var> and the
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new value of <var>state</var> (which controls further random values) do not depend
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on the machine word size.
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpfr_005furandom"></a>Function: <em>int</em> <strong>mpfr_urandom</strong> <em>(mpfr_t <var>rop</var>, gmp_randstate_t <var>state</var>, mpfr_rnd_t <var>rnd</var>)</em></dt>
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<dd><p>Generate a uniformly distributed random float.
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The floating-point number <var>rop</var> can be seen as if a random real number is
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generated according to the continuous uniform distribution on the interval
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[0, 1] and then rounded in the direction <var>rnd</var>.
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</p>
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<p>The second argument is a <code>gmp_randstate_t</code> structure which should be
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created using the GMP <code>gmp_randinit</code> function (see the GMP manual).
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</p>
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<p>Note: the note for <code>mpfr_urandomb</code> holds too. In addition, the exponent
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range and the rounding mode might have a side effect on the next random state.
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpfr_005fgrandom"></a>Function: <em>int</em> <strong>mpfr_grandom</strong> <em>(mpfr_t <var>rop1</var>, mpfr_t <var>rop2</var>, gmp_randstate_t <var>state</var>, mpfr_rnd_t <var>rnd</var>)</em></dt>
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<dd><p>Generate two random floats according to a standard normal gaussian
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distribution. If <var>rop2</var> is a null pointer, then only one value is generated
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and stored in <var>rop1</var>.
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</p>
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<p>The floating-point number <var>rop1</var> (and <var>rop2</var>) can be seen as if a
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random real number were generated according to the standard normal gaussian
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distribution and then rounded in the direction <var>rnd</var>.
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</p>
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<p>The third argument is a <code>gmp_randstate_t</code> structure, which should be
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created using the GMP <code>gmp_randinit</code> function (see the GMP manual).
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</p>
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<p>The combination of the ternary values is returned like with
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<code>mpfr_sin_cos</code>. If <var>rop2</var> is a null pointer, the second ternary
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value is assumed to be 0 (note that the encoding of the only ternary value
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is not the same as the usual encoding for functions that return only one
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result). Otherwise the ternary value of a random number is always non-zero.
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</p>
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<p>Note: the note for <code>mpfr_urandomb</code> holds too. In addition, the exponent
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range and the rounding mode might have a side effect on the next random state.
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpfr_005fget_005fexp"></a>Function: <em>mpfr_exp_t</em> <strong>mpfr_get_exp</strong> <em>(mpfr_t <var>x</var>)</em></dt>
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<dd><p>Return the exponent of <var>x</var>, assuming that <var>x</var> is a non-zero ordinary
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number and the significand is considered in [1/2,1). The behavior for NaN,
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infinity or zero is undefined.
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpfr_005fset_005fexp"></a>Function: <em>int</em> <strong>mpfr_set_exp</strong> <em>(mpfr_t <var>x</var>, mpfr_exp_t <var>e</var>)</em></dt>
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<dd><p>Set the exponent of <var>x</var> if <var>e</var> is in the current exponent range,
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and return 0 (even if <var>x</var> is not a non-zero ordinary number);
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otherwise, return a non-zero value.
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The significand is assumed to be in [1/2,1).
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpfr_005fsignbit"></a>Function: <em>int</em> <strong>mpfr_signbit</strong> <em>(mpfr_t <var>op</var>)</em></dt>
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<dd><p>Return a non-zero value iff <var>op</var> has its sign bit set (i.e., if it is
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negative, −0, or a NaN whose representation has its sign bit set).
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpfr_005fsetsign"></a>Function: <em>int</em> <strong>mpfr_setsign</strong> <em>(mpfr_t <var>rop</var>, mpfr_t <var>op</var>, int <var>s</var>, mpfr_rnd_t <var>rnd</var>)</em></dt>
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<dd><p>Set the value of <var>rop</var> from <var>op</var>, rounded toward the given
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direction <var>rnd</var>, then set (resp. clear) its sign bit if <var>s</var>
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is non-zero (resp. zero), even when <var>op</var> is a NaN.
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpfr_005fcopysign"></a>Function: <em>int</em> <strong>mpfr_copysign</strong> <em>(mpfr_t <var>rop</var>, mpfr_t <var>op1</var>, mpfr_t <var>op2</var>, mpfr_rnd_t <var>rnd</var>)</em></dt>
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<dd><p>Set the value of <var>rop</var> from <var>op1</var>, rounded toward the given
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direction <var>rnd</var>, then set its sign bit to that of <var>op2</var> (even
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when <var>op1</var> or <var>op2</var> is a NaN). This function is equivalent to
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<code>mpfr_setsign (<var>rop</var>, <var>op1</var>, mpfr_signbit (<var>op2</var>), <var>rnd</var>)</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpfr_005fget_005fversion"></a>Function: <em>const char *</em> <strong>mpfr_get_version</strong> <em>(void)</em></dt>
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<dd><p>Return the MPFR version, as a null-terminated string.
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</p></dd></dl>
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<dl>
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<dt><a name="index-MPFR_005fVERSION"></a>Macro: <strong>MPFR_VERSION</strong></dt>
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<dt><a name="index-MPFR_005fVERSION_005fMAJOR"></a>Macro: <strong>MPFR_VERSION_MAJOR</strong></dt>
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<dt><a name="index-MPFR_005fVERSION_005fMINOR"></a>Macro: <strong>MPFR_VERSION_MINOR</strong></dt>
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<dt><a name="index-MPFR_005fVERSION_005fPATCHLEVEL"></a>Macro: <strong>MPFR_VERSION_PATCHLEVEL</strong></dt>
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<dt><a name="index-MPFR_005fVERSION_005fSTRING"></a>Macro: <strong>MPFR_VERSION_STRING</strong></dt>
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<dd><p><code>MPFR_VERSION</code> is the version of MPFR as a preprocessing constant.
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<code>MPFR_VERSION_MAJOR</code>, <code>MPFR_VERSION_MINOR</code> and
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<code>MPFR_VERSION_PATCHLEVEL</code> are respectively the major, minor and patch
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level of MPFR version, as preprocessing constants.
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<code>MPFR_VERSION_STRING</code> is the version (with an optional suffix, used
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in development and pre-release versions) as a string constant, which can
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be compared to the result of <code>mpfr_get_version</code> to check at run time
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the header file and library used match:
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</p><div class="example">
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<pre class="example">if (strcmp (mpfr_get_version (), MPFR_VERSION_STRING))
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fprintf (stderr, "Warning: header and library do not match\n");
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</pre></div>
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<p>Note: Obtaining different strings is not necessarily an error, as
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in general, a program compiled with some old MPFR version can be
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dynamically linked with a newer MPFR library version (if allowed
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by the library versioning system).
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</p></dd></dl>
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<dl>
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<dt><a name="index-MPFR_005fVERSION_005fNUM"></a>Macro: <em>long</em> <strong>MPFR_VERSION_NUM</strong> <em>(<var>major</var>, <var>minor</var>, <var>patchlevel</var>)</em></dt>
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<dd><p>Create an integer in the same format as used by <code>MPFR_VERSION</code> from the
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given <var>major</var>, <var>minor</var> and <var>patchlevel</var>.
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Here is an example of how to check the MPFR version at compile time:
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</p><div class="example">
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<pre class="example">#if (!defined(MPFR_VERSION) || (MPFR_VERSION<MPFR_VERSION_NUM(3,0,0)))
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# error "Wrong MPFR version."
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#endif
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</pre></div>
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</dd></dl>
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<dl>
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<dt><a name="index-mpfr_005fget_005fpatches"></a>Function: <em>const char *</em> <strong>mpfr_get_patches</strong> <em>(void)</em></dt>
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<dd><p>Return a null-terminated string containing the ids of the patches applied to
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the MPFR library (contents of the <samp>PATCHES</samp> file), separated by spaces.
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Note: If the program has been compiled with an older MPFR version and is
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dynamically linked with a new MPFR library version, the identifiers of the
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patches applied to the old (compile-time) MPFR version are not available
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(however this information should not have much interest in general).
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpfr_005fbuildopt_005ftls_005fp"></a>Function: <em>int</em> <strong>mpfr_buildopt_tls_p</strong> <em>(void)</em></dt>
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<dd><p>Return a non-zero value if MPFR was compiled as thread safe using
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compiler-level Thread Local Storage (that is, MPFR was built with the
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<code>--enable-thread-safe</code> configure option, see <code>INSTALL</code> file), return
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zero otherwise.
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpfr_005fbuildopt_005fdecimal_005fp"></a>Function: <em>int</em> <strong>mpfr_buildopt_decimal_p</strong> <em>(void)</em></dt>
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<dd><p>Return a non-zero value if MPFR was compiled with decimal float support (that
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is, MPFR was built with the <code>--enable-decimal-float</code> configure option),
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return zero otherwise.
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpfr_005fbuildopt_005fgmpinternals_005fp"></a>Function: <em>int</em> <strong>mpfr_buildopt_gmpinternals_p</strong> <em>(void)</em></dt>
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<dd><p>Return a non-zero value if MPFR was compiled with GMP internals
|
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(that is, MPFR was built with either <code>--with-gmp-build</code> or
|
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<code>--enable-gmp-internals</code> configure option), return zero otherwise.
|
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpfr_005fbuildopt_005ftune_005fcase"></a>Function: <em>const char *</em> <strong>mpfr_buildopt_tune_case</strong> <em>(void)</em></dt>
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<dd><p>Return a string saying which thresholds file has been used at compile time.
|
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This file is normally selected from the processor type.
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</p></dd></dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Exception-Related-Functions.html#Exception-Related-Functions" accesskey="n" rel="next">Exception Related Functions</a>, Previous: <a href="Rounding-Related-Functions.html#Rounding-Related-Functions" accesskey="p" rel="prev">Rounding Related Functions</a>, Up: <a href="MPFR-Interface.html#MPFR-Interface" accesskey="u" rel="up">MPFR Interface</a> [<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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