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106 lines
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106 lines
5.5 KiB
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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<title>Applying Integer 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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<meta name="keywords" content="Applying Integer Functions (GNU MP 6.1.0)">
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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="Rational-Number-Functions.html#Rational-Number-Functions" rel="up" title="Rational Number Functions">
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<link href="I_002fO-of-Rationals.html#I_002fO-of-Rationals" rel="next" title="I/O of Rationals">
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<link href="Comparing-Rationals.html#Comparing-Rationals" rel="prev" title="Comparing Rationals">
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</head>
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<a name="Applying-Integer-Functions"></a>
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<div class="header">
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<p>
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Next: <a href="I_002fO-of-Rationals.html#I_002fO-of-Rationals" accesskey="n" rel="next">I/O of Rationals</a>, Previous: <a href="Comparing-Rationals.html#Comparing-Rationals" accesskey="p" rel="prev">Comparing Rationals</a>, Up: <a href="Rational-Number-Functions.html#Rational-Number-Functions" accesskey="u" rel="up">Rational Number 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="Applying-Integer-Functions-to-Rationals"></a>
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<h3 class="section">6.5 Applying Integer Functions to Rationals</h3>
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<a name="index-Rational-numerator-and-denominator"></a>
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<a name="index-Numerator-and-denominator"></a>
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<p>The set of <code>mpq</code> functions is quite small. In particular, there are few
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functions for either input or output. The following functions give direct
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access to the numerator and denominator of an <code>mpq_t</code>.
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</p>
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<p>Note that if an assignment to the numerator and/or denominator could take an
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<code>mpq_t</code> out of the canonical form described at the start of this chapter
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(see <a href="Rational-Number-Functions.html#Rational-Number-Functions">Rational Number Functions</a>) then <code>mpq_canonicalize</code> must be
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called before any other <code>mpq</code> functions are applied to that <code>mpq_t</code>.
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</p>
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<dl>
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<dt><a name="index-mpq_005fnumref"></a>Macro: <em>mpz_t</em> <strong>mpq_numref</strong> <em>(const mpq_t <var>op</var>)</em></dt>
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<dt><a name="index-mpq_005fdenref"></a>Macro: <em>mpz_t</em> <strong>mpq_denref</strong> <em>(const mpq_t <var>op</var>)</em></dt>
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<dd><p>Return a reference to the numerator and denominator of <var>op</var>, respectively.
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The <code>mpz</code> functions can be used on the result of these macros.
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpq_005fget_005fnum"></a>Function: <em>void</em> <strong>mpq_get_num</strong> <em>(mpz_t <var>numerator</var>, const mpq_t <var>rational</var>)</em></dt>
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<dt><a name="index-mpq_005fget_005fden"></a>Function: <em>void</em> <strong>mpq_get_den</strong> <em>(mpz_t <var>denominator</var>, const mpq_t <var>rational</var>)</em></dt>
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<dt><a name="index-mpq_005fset_005fnum"></a>Function: <em>void</em> <strong>mpq_set_num</strong> <em>(mpq_t <var>rational</var>, const mpz_t <var>numerator</var>)</em></dt>
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<dt><a name="index-mpq_005fset_005fden"></a>Function: <em>void</em> <strong>mpq_set_den</strong> <em>(mpq_t <var>rational</var>, const mpz_t <var>denominator</var>)</em></dt>
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<dd><p>Get or set the numerator or denominator of a rational. These functions are
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equivalent to calling <code>mpz_set</code> with an appropriate <code>mpq_numref</code> or
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<code>mpq_denref</code>. Direct use of <code>mpq_numref</code> or <code>mpq_denref</code> is
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recommended instead of these functions.
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</p></dd></dl>
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</body>
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</html>
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