1<html lang="en"> 2<head> 3<title>Case Ranges - Using the GNU Compiler Collection (GCC)</title> 4<meta http-equiv="Content-Type" content="text/html"> 5<meta name="description" content="Using the GNU Compiler Collection (GCC)"> 6<meta name="generator" content="makeinfo 4.13"> 7<link title="Top" rel="start" href="index.html#Top"> 8<link rel="up" href="C-Extensions.html#C-Extensions" title="C Extensions"> 9<link rel="prev" href="Cast-to-Union.html#Cast-to-Union" title="Cast to Union"> 10<link rel="next" href="Mixed-Declarations.html#Mixed-Declarations" title="Mixed Declarations"> 11<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> 12<!-- 13Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 141998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 152010 Free Software Foundation, Inc. 16 17Permission is granted to copy, distribute and/or modify this document 18under the terms of the GNU Free Documentation License, Version 1.3 or 19any later version published by the Free Software Foundation; with the 20Invariant Sections being ``Funding Free Software'', the Front-Cover 21Texts being (a) (see below), and with the Back-Cover Texts being (b) 22(see below). A copy of the license is included in the section entitled 23``GNU Free Documentation License''. 24 25(a) The FSF's Front-Cover Text is: 26 27 A GNU Manual 28 29(b) The FSF's Back-Cover Text is: 30 31 You have freedom to copy and modify this GNU Manual, like GNU 32 software. Copies published by the Free Software Foundation raise 33 funds for GNU development.--> 34<meta http-equiv="Content-Style-Type" content="text/css"> 35<style type="text/css"><!-- 36 pre.display { font-family:inherit } 37 pre.format { font-family:inherit } 38 pre.smalldisplay { font-family:inherit; font-size:smaller } 39 pre.smallformat { font-family:inherit; font-size:smaller } 40 pre.smallexample { font-size:smaller } 41 pre.smalllisp { font-size:smaller } 42 span.sc { font-variant:small-caps } 43 span.roman { font-family:serif; font-weight:normal; } 44 span.sansserif { font-family:sans-serif; font-weight:normal; } 45--></style> 46<link rel="stylesheet" type="text/css" href="../cs.css"> 47</head> 48<body> 49<div class="node"> 50<a name="Case-Ranges"></a> 51<p> 52Next: <a rel="next" accesskey="n" href="Mixed-Declarations.html#Mixed-Declarations">Mixed Declarations</a>, 53Previous: <a rel="previous" accesskey="p" href="Cast-to-Union.html#Cast-to-Union">Cast to Union</a>, 54Up: <a rel="up" accesskey="u" href="C-Extensions.html#C-Extensions">C Extensions</a> 55<hr> 56</div> 57 58<h3 class="section">6.27 Case Ranges</h3> 59 60<p><a name="index-case-ranges-2385"></a><a name="index-ranges-in-case-statements-2386"></a> 61You can specify a range of consecutive values in a single <code>case</code> label, 62like this: 63 64<pre class="smallexample"> case <var>low</var> ... <var>high</var>: 65</pre> 66 <p class="noindent">This has the same effect as the proper number of individual <code>case</code> 67labels, one for each integer value from <var>low</var> to <var>high</var>, inclusive. 68 69 <p>This feature is especially useful for ranges of ASCII character codes: 70 71<pre class="smallexample"> case 'A' ... 'Z': 72</pre> 73 <p><strong>Be careful:</strong> Write spaces around the <code>...</code>, for otherwise 74it may be parsed wrong when you use it with integer values. For example, 75write this: 76 77<pre class="smallexample"> case 1 ... 5: 78</pre> 79 <p class="noindent">rather than this: 80 81<pre class="smallexample"> case 1...5: 82</pre> 83 </body></html> 84 85