106 lines
6.4 KiB
HTML
106 lines
6.4 KiB
HTML
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<!DOCTYPE html>
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<html>
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<!-- Created by GNU Texinfo 7.1, https://www.gnu.org/software/texinfo/ -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<!-- This manual documents Guile version 3.0.10.
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Copyright (C) 1996-1997, 2000-2005, 2009-2023 Free Software Foundation,
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Inc.
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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with no
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Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
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copy of the license is included in the section entitled "GNU Free
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Documentation License." -->
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<title>Conversion (Guile Reference Manual)</title>
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<meta name="description" content="Conversion (Guile Reference Manual)">
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<meta name="keywords" content="Conversion (Guile Reference Manual)">
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<link href="index.html" rel="start" title="Top">
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<link href="Concept-Index.html" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Numbers.html" rel="up" title="Numbers">
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<link href="Complex.html" rel="next" title="Complex">
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<link href="Comparison.html" rel="prev" title="Comparison">
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<style type="text/css">
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a.copiable-link {visibility: hidden; text-decoration: none; line-height: 0em}
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<link rel="stylesheet" type="text/css" href="https://www.gnu.org/software/gnulib/manual.css">
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</head>
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<body lang="en">
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<div class="subsubsection-level-extent" id="Conversion">
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<div class="nav-panel">
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<p>
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Next: <a href="Complex.html" accesskey="n" rel="next">Complex Number Operations</a>, Previous: <a href="Comparison.html" accesskey="p" rel="prev">Comparison Predicates</a>, Up: <a href="Numbers.html" accesskey="u" rel="up">Numerical data types</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<h4 class="subsubsection" id="Converting-Numbers-To-and-From-Strings"><span>6.6.2.9 Converting Numbers To and From Strings<a class="copiable-link" href="#Converting-Numbers-To-and-From-Strings"> ¶</a></span></h4>
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<a class="index-entry-id" id="index-number_002d_003estring-2"></a>
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<a class="index-entry-id" id="index-string_002d_003enumber-3"></a>
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<p>The following procedures read and write numbers according to their
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external representation as defined by R5RS (see <a data-manual="r5rs" href="../r5rs_html/Lexical-structure.html#Lexical-structure">R5RS Lexical Structure</a> in <cite class="cite">The Revised^5 Report on the Algorithmic
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Language Scheme</cite>). See <a class="xref" href="Number-Input-and-Output.html">the <code class="code">(ice-9
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i18n)</code> module</a>, for locale-dependent number parsing.
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</p>
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<dl class="first-deffn">
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<dt class="deffn" id="index-number_002d_003estring"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">number->string</strong> <var class="def-var-arguments">n [radix]</var><a class="copiable-link" href="#index-number_002d_003estring"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fnumber_005fto_005fstring"><span class="category-def">C Function: </span><span><strong class="def-name">scm_number_to_string</strong> <var class="def-var-arguments">(n, radix)</var><a class="copiable-link" href="#index-scm_005fnumber_005fto_005fstring"> ¶</a></span></dt>
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<dd><p>Return a string holding the external representation of the
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number <var class="var">n</var> in the given <var class="var">radix</var>. If <var class="var">n</var> is
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inexact, a radix of 10 will be used.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-string_002d_003enumber"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">string->number</strong> <var class="def-var-arguments">string [radix]</var><a class="copiable-link" href="#index-string_002d_003enumber"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fstring_005fto_005fnumber"><span class="category-def">C Function: </span><span><strong class="def-name">scm_string_to_number</strong> <var class="def-var-arguments">(string, radix)</var><a class="copiable-link" href="#index-scm_005fstring_005fto_005fnumber"> ¶</a></span></dt>
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<dd><p>Return a number of the maximally precise representation
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expressed by the given <var class="var">string</var>. <var class="var">radix</var> must be an
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exact integer, either 2, 8, 10, or 16. If supplied, <var class="var">radix</var>
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is a default radix that may be overridden by an explicit radix
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prefix in <var class="var">string</var> (e.g. "#o177"). If <var class="var">radix</var> is not
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supplied, then the default radix is 10. If string is not a
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syntactically valid notation for a number, then
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<code class="code">string->number</code> returns <code class="code">#f</code>.
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</p></dd></dl>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-scm_005fc_005flocale_005fstringn_005fto_005fnumber"><span class="category-def">C Function: </span><span><code class="def-type">SCM</code> <strong class="def-name">scm_c_locale_stringn_to_number</strong> <code class="def-code-arguments">(const char *string, size_t len, unsigned radix)</code><a class="copiable-link" href="#index-scm_005fc_005flocale_005fstringn_005fto_005fnumber"> ¶</a></span></dt>
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<dd><p>As per <code class="code">string->number</code> above, but taking a C string, as pointer
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and length. The string characters should be in the current locale
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encoding (<code class="code">locale</code> in the name refers only to that, there’s no
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locale-dependent parsing).
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</p></dd></dl>
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</div>
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<hr>
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<div class="nav-panel">
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<p>
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Next: <a href="Complex.html">Complex Number Operations</a>, Previous: <a href="Comparison.html">Comparison Predicates</a>, Up: <a href="Numbers.html">Numerical data types</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" 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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