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125 lines
6.1 KiB
HTML
125 lines
6.1 KiB
HTML
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<html>
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<!-- This manual documents how to install and use the Multiple Precision
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Floating-Point Reliable Library, version 3.1.4.
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Copyright 1991, 1993-2016 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>Input and Output Functions (GNU MPFR 3.1.4)</title>
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<meta name="description" content="How to install and use GNU MPFR, a library for reliable multiple precision
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floating-point arithmetic, version 3.1.4.">
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<meta name="keywords" content="Input and Output Functions (GNU MPFR 3.1.4)">
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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="MPFR-Interface.html#MPFR-Interface" rel="up" title="MPFR Interface">
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<link href="Formatted-Output-Functions.html#Formatted-Output-Functions" rel="next" title="Formatted Output Functions">
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<link href="Special-Functions.html#Special-Functions" rel="prev" title="Special Functions">
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</head>
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<body lang="en">
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<a name="Input-and-Output-Functions"></a>
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<div class="header">
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<p>
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Next: <a href="Formatted-Output-Functions.html#Formatted-Output-Functions" accesskey="n" rel="next">Formatted Output Functions</a>, Previous: <a href="Special-Functions.html#Special-Functions" accesskey="p" rel="prev">Special Functions</a>, Up: <a href="MPFR-Interface.html#MPFR-Interface" accesskey="u" rel="up">MPFR Interface</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="index-Float-input-and-output-functions"></a>
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<a name="index-Input-functions"></a>
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<a name="index-Output-functions"></a>
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<a name="index-I_002fO-functions"></a>
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<a name="Input-and-Output-Functions-1"></a>
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<h3 class="section">5.8 Input and Output Functions</h3>
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<p>This section describes functions that perform input from an input/output
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stream, and functions that output to an input/output stream.
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Passing a null pointer for a <code>stream</code> to any of these functions will make
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them read from <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, you must include the <code><stdio.h></code>
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standard header before <samp>mpfr.h</samp>, to allow <samp>mpfr.h</samp> to define
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prototypes for these functions.
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</p>
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<dl>
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<dt><a name="index-mpfr_005fout_005fstr"></a>Function: <em>size_t</em> <strong>mpfr_out_str</strong> <em>(FILE *<var>stream</var>, int <var>base</var>, size_t <var>n</var>, mpfr_t <var>op</var>, mpfr_rnd_t <var>rnd</var>)</em></dt>
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<dd><p>Output <var>op</var> on stream <var>stream</var>, as a string of digits in
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base <var>base</var>, rounded in the direction <var>rnd</var>.
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The base may vary from 2 to 62. Print <var>n</var> significant digits exactly,
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or if <var>n</var> is 0, enough digits so that <var>op</var> can be read back
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exactly (see <code>mpfr_get_str</code>).
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</p>
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<p>In addition to the significant digits, a decimal point (defined by the
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current locale) at the right of the
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first digit and a trailing exponent in base 10, in the form ‘<samp>eNNN</samp>’,
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are printed. If <var>base</var> is greater than 10, ‘<samp>@</samp>’ will be used
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instead of ‘<samp>e</samp>’ as exponent delimiter.
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</p>
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<p>Return the number of characters 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-mpfr_005finp_005fstr"></a>Function: <em>size_t</em> <strong>mpfr_inp_str</strong> <em>(mpfr_t <var>rop</var>, FILE *<var>stream</var>, int <var>base</var>, mpfr_rnd_t <var>rnd</var>)</em></dt>
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<dd><p>Input a string in base <var>base</var> from stream <var>stream</var>,
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rounded in the direction <var>rnd</var>, and put the
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read float in <var>rop</var>.
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</p>
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<p>This function reads a word (defined as a sequence of characters between
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whitespace) and parses it using <code>mpfr_set_str</code>.
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See the documentation of <code>mpfr_strtofr</code> for a detailed description
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of the valid string formats.
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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="Formatted-Output-Functions.html#Formatted-Output-Functions" accesskey="n" rel="next">Formatted Output Functions</a>, Previous: <a href="Special-Functions.html#Special-Functions" accesskey="p" rel="prev">Special Functions</a>, Up: <a href="MPFR-Interface.html#MPFR-Interface" accesskey="u" rel="up">MPFR Interface</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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