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136 lines
7.4 KiB
HTML
136 lines
7.4 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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version published by the Free Software Foundation; with no Invariant Sections,
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with the Front-Cover Texts being "A GNU Manual", and with the Back-Cover
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software". A copy of the license is included in
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GNU Free Documentation License. -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Assigning Floats (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="Assigning Floats (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="Simultaneous-Float-Init-_0026-Assign.html#Simultaneous-Float-Init-_0026-Assign" rel="next" title="Simultaneous Float Init & Assign">
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<link href="Initializing-Floats.html#Initializing-Floats" rel="prev" title="Initializing Floats">
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</head>
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<body lang="en">
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<a name="Assigning-Floats"></a>
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<div class="header">
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<p>
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Next: <a href="Simultaneous-Float-Init-_0026-Assign.html#Simultaneous-Float-Init-_0026-Assign" accesskey="n" rel="next">Simultaneous Float Init & Assign</a>, Previous: <a href="Initializing-Floats.html#Initializing-Floats" accesskey="p" rel="prev">Initializing 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="Assignment-Functions-1"></a>
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<h3 class="section">7.2 Assignment Functions</h3>
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<a name="index-Float-assignment-functions"></a>
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<a name="index-Assignment-functions-3"></a>
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<p>These functions assign new values to already initialized floats
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(see <a href="Initializing-Floats.html#Initializing-Floats">Initializing Floats</a>).
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</p>
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<dl>
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<dt><a name="index-mpf_005fset"></a>Function: <em>void</em> <strong>mpf_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_005fset_005fui"></a>Function: <em>void</em> <strong>mpf_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_005fset_005fsi"></a>Function: <em>void</em> <strong>mpf_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_005fset_005fd"></a>Function: <em>void</em> <strong>mpf_set_d</strong> <em>(mpf_t <var>rop</var>, double <var>op</var>)</em></dt>
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<dt><a name="index-mpf_005fset_005fz"></a>Function: <em>void</em> <strong>mpf_set_z</strong> <em>(mpf_t <var>rop</var>, const mpz_t <var>op</var>)</em></dt>
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<dt><a name="index-mpf_005fset_005fq"></a>Function: <em>void</em> <strong>mpf_set_q</strong> <em>(mpf_t <var>rop</var>, const mpq_t <var>op</var>)</em></dt>
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<dd><p>Set the value of <var>rop</var> from <var>op</var>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpf_005fset_005fstr"></a>Function: <em>int</em> <strong>mpf_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>Set the value of <var>rop</var> from the string in <var>str</var>. The string is of the
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form ‘<samp>M@N</samp>’ or, if the base is 10 or less, alternatively ‘<samp>MeN</samp>’.
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‘<samp>M</samp>’ is the mantissa and ‘<samp>N</samp>’ is the exponent. The mantissa is always
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in the specified base. The exponent is either in the specified base or, if
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<var>base</var> is negative, in decimal. The decimal point expected is taken from
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the current locale, on systems providing <code>localeconv</code>.
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</p>
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<p>The argument <var>base</var> may be in the ranges 2 to 62, or -62 to
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-2. Negative values are used to specify that the exponent is in
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decimal.
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</p>
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<p>For bases up to 36, case is ignored; upper-case and lower-case letters have
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the same value; for bases 37 to 62, upper-case letter represent the usual
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10..35 while lower-case letter represent 36..61.
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</p>
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<p>Unlike the corresponding <code>mpz</code> function, the base will not be determined
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from the leading characters of the string if <var>base</var> is 0. This is so that
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numbers like ‘<samp>0.23</samp>’ are not interpreted as octal.
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</p>
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<p>White space is allowed in the string, and is simply ignored. [This is not
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really true; white-space is ignored in the beginning of the string and within
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the mantissa, but not in other places, such as after a minus sign or in the
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exponent. We are considering changing the definition of this function, making
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it fail when there is any white-space in the input, since that makes a lot of
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sense. Please tell us your opinion about this change. Do you really want it
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to accept <code>"3 14"</code> as meaning 314 as it does now?]
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</p>
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<p>This function returns 0 if the entire string is a valid number in base
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<var>base</var>. Otherwise it returns -1.
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpf_005fswap"></a>Function: <em>void</em> <strong>mpf_swap</strong> <em>(mpf_t <var>rop1</var>, mpf_t <var>rop2</var>)</em></dt>
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<dd><p>Swap <var>rop1</var> and <var>rop2</var> efficiently. Both the values and the
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precisions of the two variables are swapped.
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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="Simultaneous-Float-Init-_0026-Assign.html#Simultaneous-Float-Init-_0026-Assign" accesskey="n" rel="next">Simultaneous Float Init & Assign</a>, Previous: <a href="Initializing-Floats.html#Initializing-Floats" accesskey="p" rel="prev">Initializing 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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