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126 lines
6.4 KiB
HTML
126 lines
6.4 KiB
HTML
4 years ago
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<!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 Rationals (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 Rationals (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="Rational-Number-Functions.html#Rational-Number-Functions" rel="up" title="Rational Number Functions">
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<link href="Floating_002dpoint-Functions.html#Floating_002dpoint-Functions" rel="next" title="Floating-point Functions">
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<link href="Applying-Integer-Functions.html#Applying-Integer-Functions" rel="prev" title="Applying Integer Functions">
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<style type="text/css">
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<!--
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a.summary-letter {text-decoration: none}
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blockquote.indentedblock {margin-right: 0em}
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blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
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blockquote.smallquotation {font-size: smaller}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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pre.display {font-family: inherit}
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pre.smalllisp {font-size: smaller}
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span.nolinebreak {white-space: nowrap}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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-->
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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-Rationals"></a>
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<div class="header">
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<p>
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Previous: <a href="Applying-Integer-Functions.html#Applying-Integer-Functions" accesskey="p" rel="prev">Applying Integer Functions</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="Input-and-Output-Functions-1"></a>
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<h3 class="section">6.6 Input and Output Functions</h3>
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<a name="index-Rational-input-and-output-functions"></a>
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<a name="index-Input-functions-1"></a>
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<a name="index-Output-functions-1"></a>
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<a name="index-I_002fO-functions-1"></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>mpq</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-mpq_005fout_005fstr"></a>Function: <em>size_t</em> <strong>mpq_out_str</strong> <em>(FILE *<var>stream</var>, int <var>base</var>, const mpq_t <var>op</var>)</em></dt>
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<dd><p>Output <var>op</var> on stdio stream <var>stream</var>, as a string of digits in base
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<var>base</var>. The base may vary from 2 to 36. Output is in the form
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‘<samp>num/den</samp>’ or if the denominator is 1 then just ‘<samp>num</samp>’.
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</p>
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<p>Return the number of bytes written, or if an error occurred, return 0.
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpq_005finp_005fstr"></a>Function: <em>size_t</em> <strong>mpq_inp_str</strong> <em>(mpq_t <var>rop</var>, FILE *<var>stream</var>, int <var>base</var>)</em></dt>
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<dd><p>Read a string of digits from <var>stream</var> and convert them to a rational in
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<var>rop</var>. Any initial white-space characters are read and discarded. Return
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the number of characters read (including white space), or 0 if a rational
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could not be read.
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</p>
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<p>The input can be a fraction like ‘<samp>17/63</samp>’ or just an integer like
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‘<samp>123</samp>’. Reading stops at the first character not in this form, and white
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space is not permitted within the string. If the input might not be in
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canonical form, then <code>mpq_canonicalize</code> must be called (see <a href="Rational-Number-Functions.html#Rational-Number-Functions">Rational Number Functions</a>).
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</p>
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<p>The <var>base</var> can be between 2 and 36, or can be 0 in which case the leading
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characters of the string determine the base, ‘<samp>0x</samp>’ or ‘<samp>0X</samp>’ for
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hexadecimal, ‘<samp>0</samp>’ for octal, or decimal otherwise. The leading characters
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are examined separately for the numerator and denominator of a fraction, so
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for instance ‘<samp>0x10/11</samp>’ is <em>16/11</em>, whereas ‘<samp>0x10/0x11</samp>’ is
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<em>16/17</em>.
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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="Applying-Integer-Functions.html#Applying-Integer-Functions" accesskey="p" rel="prev">Applying Integer Functions</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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</body>
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</html>
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