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113 lines
5.6 KiB
HTML
113 lines
5.6 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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<head>
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<title>Simultaneous Float Init & Assign (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="Simultaneous Float Init & Assign (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="Floating_002dpoint-Functions.html#Floating_002dpoint-Functions" rel="up" title="Floating-point Functions">
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<link href="Converting-Floats.html#Converting-Floats" rel="next" title="Converting Floats">
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<link href="Assigning-Floats.html#Assigning-Floats" rel="prev" title="Assigning Floats">
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</head>
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<body lang="en">
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<a name="Simultaneous-Float-Init-_0026-Assign"></a>
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<div class="header">
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<p>
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Next: <a href="Converting-Floats.html#Converting-Floats" accesskey="n" rel="next">Converting Floats</a>, Previous: <a href="Assigning-Floats.html#Assigning-Floats" accesskey="p" rel="prev">Assigning 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="Combined-Initialization-and-Assignment-Functions-1"></a>
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<h3 class="section">7.3 Combined Initialization and Assignment Functions</h3>
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<a name="index-Float-assignment-functions-1"></a>
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<a name="index-Assignment-functions-4"></a>
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<a name="index-Float-initialization-functions-1"></a>
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<a name="index-Initialization-functions-4"></a>
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<p>For convenience, GMP provides a parallel series of initialize-and-set functions
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which initialize the output and then store the value there. These functions’
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names have the form <code>mpf_init_set…</code>
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</p>
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<p>Once the float has been initialized by any of the <code>mpf_init_set…</code>
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functions, it can be used as the source or destination operand for the ordinary
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float functions. Don’t use an initialize-and-set function on a variable
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already initialized!
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</p>
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<dl>
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<dt><a name="index-mpf_005finit_005fset"></a>Function: <em>void</em> <strong>mpf_init_set</strong> <em>(mpf_t <var>rop</var>, const mpf_t <var>op</var>)</em></dt>
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<dt><a name="index-mpf_005finit_005fset_005fui"></a>Function: <em>void</em> <strong>mpf_init_set_ui</strong> <em>(mpf_t <var>rop</var>, unsigned long int <var>op</var>)</em></dt>
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<dt><a name="index-mpf_005finit_005fset_005fsi"></a>Function: <em>void</em> <strong>mpf_init_set_si</strong> <em>(mpf_t <var>rop</var>, signed long int <var>op</var>)</em></dt>
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<dt><a name="index-mpf_005finit_005fset_005fd"></a>Function: <em>void</em> <strong>mpf_init_set_d</strong> <em>(mpf_t <var>rop</var>, double <var>op</var>)</em></dt>
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<dd><p>Initialize <var>rop</var> and set its value from <var>op</var>.
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</p>
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<p>The precision of <var>rop</var> will be taken from the active default precision, as
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set by <code>mpf_set_default_prec</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpf_005finit_005fset_005fstr"></a>Function: <em>int</em> <strong>mpf_init_set_str</strong> <em>(mpf_t <var>rop</var>, const char *<var>str</var>, int <var>base</var>)</em></dt>
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<dd><p>Initialize <var>rop</var> and set its value from the string in <var>str</var>. See
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<code>mpf_set_str</code> above for details on the assignment operation.
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</p>
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<p>Note that <var>rop</var> is initialized even if an error occurs. (I.e., you have to
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call <code>mpf_clear</code> for it.)
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</p>
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<p>The precision of <var>rop</var> will be taken from the active default precision, as
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set by <code>mpf_set_default_prec</code>.
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</p></dd></dl>
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</body>
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</html>
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