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135 lines
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135 lines
7.1 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This manual describes how to install and use the GNU multiple precision
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arithmetic library, version 6.1.0.
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Copyright 1991, 1993-2015 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document under
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the terms of the GNU Free Documentation License, Version 1.3 or any later
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<head>
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<title>Miscellaneous Float Functions (GNU MP 6.1.0)</title>
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<meta name="description" content="How to install and use the GNU multiple precision arithmetic library, version 6.1.0.">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="Floating_002dpoint-Functions.html#Floating_002dpoint-Functions" rel="up" title="Floating-point Functions">
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<link href="Low_002dlevel-Functions.html#Low_002dlevel-Functions" rel="next" title="Low-level Functions">
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</head>
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<body lang="en">
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<a name="Miscellaneous-Float-Functions"></a>
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<div class="header">
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<p>
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Previous: <a href="I_002fO-of-Floats.html#I_002fO-of-Floats" accesskey="p" rel="prev">I/O of Floats</a>, Up: <a href="Floating_002dpoint-Functions.html#Floating_002dpoint-Functions" accesskey="u" rel="up">Floating-point Functions</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="Miscellaneous-Functions-1"></a>
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<h3 class="section">7.8 Miscellaneous Functions</h3>
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<a name="index-Miscellaneous-float-functions"></a>
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<a name="index-Float-miscellaneous-functions"></a>
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<dl>
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<dt><a name="index-mpf_005fceil"></a>Function: <em>void</em> <strong>mpf_ceil</strong> <em>(mpf_t <var>rop</var>, const mpf_t <var>op</var>)</em></dt>
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<dt><a name="index-mpf_005ffloor"></a>Function: <em>void</em> <strong>mpf_floor</strong> <em>(mpf_t <var>rop</var>, const mpf_t <var>op</var>)</em></dt>
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<dt><a name="index-mpf_005ftrunc"></a>Function: <em>void</em> <strong>mpf_trunc</strong> <em>(mpf_t <var>rop</var>, const mpf_t <var>op</var>)</em></dt>
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<dd><a name="index-Rounding-functions"></a>
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<a name="index-Float-rounding-functions"></a>
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<p>Set <var>rop</var> to <var>op</var> rounded to an integer. <code>mpf_ceil</code> rounds to the
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next higher integer, <code>mpf_floor</code> to the next lower, and <code>mpf_trunc</code>
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to the integer towards zero.
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpf_005finteger_005fp"></a>Function: <em>int</em> <strong>mpf_integer_p</strong> <em>(const mpf_t <var>op</var>)</em></dt>
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<dd><p>Return non-zero if <var>op</var> is an integer.
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpf_005ffits_005fulong_005fp"></a>Function: <em>int</em> <strong>mpf_fits_ulong_p</strong> <em>(const mpf_t <var>op</var>)</em></dt>
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<dt><a name="index-mpf_005ffits_005fslong_005fp"></a>Function: <em>int</em> <strong>mpf_fits_slong_p</strong> <em>(const mpf_t <var>op</var>)</em></dt>
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<dt><a name="index-mpf_005ffits_005fuint_005fp"></a>Function: <em>int</em> <strong>mpf_fits_uint_p</strong> <em>(const mpf_t <var>op</var>)</em></dt>
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<dt><a name="index-mpf_005ffits_005fsint_005fp"></a>Function: <em>int</em> <strong>mpf_fits_sint_p</strong> <em>(const mpf_t <var>op</var>)</em></dt>
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<dt><a name="index-mpf_005ffits_005fushort_005fp"></a>Function: <em>int</em> <strong>mpf_fits_ushort_p</strong> <em>(const mpf_t <var>op</var>)</em></dt>
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<dt><a name="index-mpf_005ffits_005fsshort_005fp"></a>Function: <em>int</em> <strong>mpf_fits_sshort_p</strong> <em>(const mpf_t <var>op</var>)</em></dt>
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<dd><p>Return non-zero if <var>op</var> would fit in the respective C data type, when
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truncated to an integer.
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpf_005furandomb"></a>Function: <em>void</em> <strong>mpf_urandomb</strong> <em>(mpf_t <var>rop</var>, gmp_randstate_t <var>state</var>, mp_bitcnt_t <var>nbits</var>)</em></dt>
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<dd><a name="index-Random-number-functions-1"></a>
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<a name="index-Float-random-number-functions"></a>
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<p>Generate a uniformly distributed random float in <var>rop</var>, such that <em>0
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<= <var>rop</var> < 1</em>, with <var>nbits</var> significant bits in the mantissa or
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less if the precision of <var>rop</var> is smaller.
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</p>
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<p>The variable <var>state</var> must be initialized by calling one of the
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<code>gmp_randinit</code> functions (<a href="Random-State-Initialization.html#Random-State-Initialization">Random State Initialization</a>) before
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invoking this function.
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpf_005frandom2"></a>Function: <em>void</em> <strong>mpf_random2</strong> <em>(mpf_t <var>rop</var>, mp_size_t <var>max_size</var>, mp_exp_t <var>exp</var>)</em></dt>
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<dd><p>Generate a random float of at most <var>max_size</var> limbs, with long strings of
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zeros and ones in the binary representation. The exponent of the number is in
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the interval -<var>exp</var> to <var>exp</var> (in limbs). This function is
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useful for testing functions and algorithms, since these kind of random
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numbers have proven to be more likely to trigger corner-case bugs. Negative
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random numbers are generated when <var>max_size</var> is negative.
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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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Previous: <a href="I_002fO-of-Floats.html#I_002fO-of-Floats" accesskey="p" rel="prev">I/O of Floats</a>, Up: <a href="Floating_002dpoint-Functions.html#Floating_002dpoint-Functions" accesskey="u" rel="up">Floating-point Functions</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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