117 lines
4.5 KiB
HTML
117 lines
4.5 KiB
HTML
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<head>
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<title>Using the GNU Compiler Collection (GCC): Case Ranges</title>
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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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<a name="Case-Ranges"></a>
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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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