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core/com.nokia.carbide.cpp.compiler.doc.user/html/c_compiler/c_expand_trigraphs.htm
author timkelly
Thu, 10 Dec 2009 13:45:47 -0600
branchRCL_2_4
changeset 671 80524b72f957
parent 0 fb279309251b
child 1641 2b3996fc09a1
permissions -rw-r--r--
Add S60 5.2 support.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN"><html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
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<meta http-equiv="Content-Style-Type" content="text/css" />
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<meta name="LASTUPDATED" content="06/17/05 11:09:43" />
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<title>Expand Trigraphs</title>
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<link rel="StyleSheet" href="../../book.css" type="text/css"/>
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</head>
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<body bgcolor="#FFFFFF">
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<h3>Expand Trigraphs</h3>
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<p>(ISO C, &sect;5.2.1.1) The C compiler normally ignores trigraph characters. Many common character constants look like trigraph sequences, and this extension lets you use them without including escape characters.</p>
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<p>If you must write source code that strictly adheres to the ISO standard, enable the <a href="../pragmas/p_trigraphs.htm">Expand Trigraphs</a> setting. When you enable this setting, be careful when initializing strings or multi-character constants that contain question marks.</p>
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<p class="listing">char c = '????'; // ERROR: Trigraph sequence expands to '??^<br />
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  char d = '\?\?\?\?'; // OK</p>
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<p>The <a href="../pragmas/p_trigraphs.htm">Expand Trigraphs</a> setting corresponds to the pragma trigraphs, To check this setting, use <span class="code">__option (trigraphs)</span>. By default, this setting is disabled.</p>
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<p>See also &ldquo;trigraphs&rdquo; and <a href="../symbols/sym_settings.htm">Checking Settings</a>.
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</p>
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<div id="footer">Copyright &copy; 2009 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. <br>License: <a href="http://www.eclipse.org/legal/epl-v10.html">http://www.eclipse.org/legal/epl-v10.html</a></div>
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FCL/sftools/dev/ide/carbidecpp