117 lines
4.5 KiB
HTML
117 lines
4.5 KiB
HTML
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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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<!-- Copyright (C) 1988-2016 Free Software Foundation, Inc.
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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 the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Using the GNU Compiler Collection (GCC): Case Ranges</title>
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<meta name="description" content="Using the GNU Compiler Collection (GCC): Case Ranges">
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<meta name="keywords" content="Using the GNU Compiler Collection (GCC): Case Ranges">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="C-Extensions.html#C-Extensions" rel="up" title="C Extensions">
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<link href="Cast-to-Union.html#Cast-to-Union" rel="next" title="Cast to Union">
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<link href="Designated-Inits.html#Designated-Inits" rel="prev" title="Designated Inits">
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</style>
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</head>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="Case-Ranges"></a>
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<div class="header">
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<p>
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Next: <a href="Cast-to-Union.html#Cast-to-Union" accesskey="n" rel="next">Cast to Union</a>, Previous: <a href="Designated-Inits.html#Designated-Inits" accesskey="p" rel="prev">Designated Inits</a>, Up: <a href="C-Extensions.html#C-Extensions" accesskey="u" rel="up">C Extensions</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Case-Ranges-1"></a>
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<h3 class="section">6.28 Case Ranges</h3>
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<a name="index-case-ranges"></a>
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<a name="index-ranges-in-case-statements"></a>
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<p>You can specify a range of consecutive values in a single <code>case</code> label,
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like this:
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</p>
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<div class="smallexample">
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<pre class="smallexample">case <var>low</var> ... <var>high</var>:
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</pre></div>
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<p>This has the same effect as the proper number of individual <code>case</code>
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labels, one for each integer value from <var>low</var> to <var>high</var>, inclusive.
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</p>
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<p>This feature is especially useful for ranges of ASCII character codes:
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</p>
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<div class="smallexample">
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<pre class="smallexample">case 'A' ... 'Z':
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</pre></div>
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<p><strong>Be careful:</strong> Write spaces around the <code>...</code>, for otherwise
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it may be parsed wrong when you use it with integer values. For example,
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write this:
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</p>
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<div class="smallexample">
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<pre class="smallexample">case 1 ... 5:
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</pre></div>
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<p>rather than this:
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</p>
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<div class="smallexample">
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<pre class="smallexample">case 1...5:
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</pre></div>
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</body>
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</html>
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