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141 lines
7.2 KiB
HTML
141 lines
7.2 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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Texts being "You have freedom to copy and modify this GNU Manual, like GNU
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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>I/O of 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="I/O of Floats (GNU MP 6.1.0)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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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="Miscellaneous-Float-Functions.html#Miscellaneous-Float-Functions" rel="next" title="Miscellaneous Float Functions">
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<link href="Float-Comparison.html#Float-Comparison" rel="prev" title="Float Comparison">
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<style type="text/css">
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</style>
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</head>
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<body lang="en">
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<a name="I_002fO-of-Floats"></a>
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<div class="header">
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<p>
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Next: <a href="Miscellaneous-Float-Functions.html#Miscellaneous-Float-Functions" accesskey="n" rel="next">Miscellaneous Float Functions</a>, Previous: <a href="Float-Comparison.html#Float-Comparison" accesskey="p" rel="prev">Float Comparison</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="Input-and-Output-Functions-2"></a>
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<h3 class="section">7.7 Input and Output Functions</h3>
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<a name="index-Float-input-and-output-functions"></a>
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<a name="index-Input-functions-2"></a>
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<a name="index-Output-functions-2"></a>
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<a name="index-I_002fO-functions-2"></a>
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<p>Functions that perform input from a stdio stream, and functions that output to
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a stdio stream, of <code>mpf</code> numbers. Passing a <code>NULL</code> pointer for a
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<var>stream</var> argument to any of these functions will make them read from
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<code>stdin</code> and write to <code>stdout</code>, respectively.
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</p>
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<p>When using any of these functions, it is a good idea to include <samp>stdio.h</samp>
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before <samp>gmp.h</samp>, since that will allow <samp>gmp.h</samp> to define prototypes
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for these functions.
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</p>
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<p>See also <a href="Formatted-Output.html#Formatted-Output">Formatted Output</a> and <a href="Formatted-Input.html#Formatted-Input">Formatted Input</a>.
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</p>
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<dl>
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<dt><a name="index-mpf_005fout_005fstr"></a>Function: <em>size_t</em> <strong>mpf_out_str</strong> <em>(FILE *<var>stream</var>, int <var>base</var>, size_t <var>n_digits</var>, const mpf_t <var>op</var>)</em></dt>
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<dd><p>Print <var>op</var> to <var>stream</var>, as a string of digits. Return the number of
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bytes written, or if an error occurred, return 0.
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</p>
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<p>The mantissa is prefixed with an ‘<samp>0.</samp>’ and is in the given <var>base</var>,
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which may vary from 2 to 62 or from -2 to -36. An exponent is
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then printed, separated by an ‘<samp>e</samp>’, or if the base is greater than 10 then
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by an ‘<samp>@</samp>’. The exponent is always in decimal. The decimal point follows
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the current locale, on systems providing <code>localeconv</code>.
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</p>
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<p>For <var>base</var> in the range 2..36, digits and lower-case letters are used; for
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-2..-36, digits and upper-case letters are used; for 37..62,
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digits, upper-case letters, and lower-case letters (in that significance order)
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are used.
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</p>
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<p>Up to <var>n_digits</var> will be printed from the mantissa, except that no more
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digits than are accurately representable by <var>op</var> will be printed.
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<var>n_digits</var> can be 0 to select that accurate maximum.
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpf_005finp_005fstr"></a>Function: <em>size_t</em> <strong>mpf_inp_str</strong> <em>(mpf_t <var>rop</var>, FILE *<var>stream</var>, int <var>base</var>)</em></dt>
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<dd><p>Read a string in base <var>base</var> from <var>stream</var>, and put the read float in
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<var>rop</var>. The string is of the form ‘<samp>M@N</samp>’ or, if the base is 10 or
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less, alternatively ‘<samp>MeN</samp>’. ‘<samp>M</samp>’ is the mantissa and ‘<samp>N</samp>’ is the
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exponent. The mantissa is always in the specified base. The exponent is
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either in the specified base or, if <var>base</var> is negative, in decimal. The
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decimal point expected is taken from the current locale, on systems providing
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<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 36, or -36 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>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>Return the number of bytes read, or if an error occurred, return 0.
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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="Miscellaneous-Float-Functions.html#Miscellaneous-Float-Functions" accesskey="n" rel="next">Miscellaneous Float Functions</a>, Previous: <a href="Float-Comparison.html#Float-Comparison" accesskey="p" rel="prev">Float Comparison</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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