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| 22 | <title>Characters (GNU C Language Manual)</title>
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| 30 | <link href="Symbol-Index.html" rel="index" title="Symbol Index">
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| 31 | <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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| 32 | <link href="Lexical-Syntax.html" rel="up" title="Lexical Syntax">
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| 55 | </head>
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| 57 | <body lang="en">
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| 58 | <span id="Characters"></span><div class="header">
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| 59 | <p>
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| 60 | Next: <a href="Whitespace.html" accesskey="n" rel="next">Whitespace</a>, Previous: <a href="English.html" accesskey="p" rel="prev">English</a>, Up: <a href="Lexical-Syntax.html" accesskey="u" rel="up">Lexical Syntax</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Symbol-Index.html" title="Index" rel="index">Index</a>]</p>
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| 61 | </div>
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| 62 | <hr>
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| 63 | <span id="Characters-1"></span><h3 class="section">5.2 Characters</h3>
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| 64 | <span id="index-character-set"></span>
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| 65 | <span id="index-Unicode"></span>
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| 66 |
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| 67 |
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| 68 | <p>GNU C source files are usually written in the
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| 69 | <a href="https://en.wikipedia.org/wiki/ASCII">ASCII</a> character set, which
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| 70 | was defined in the 1960s for English. However, they can also include
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| 71 | Unicode characters represented in the
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| 72 | <a href="https://en.wikipedia.org/wiki/UTF-8">UTF-8</a> multibyte encoding.
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| 73 | This makes it possible to represent accented letters such as ‘<samp>á</samp>’,
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| 74 | as well as other scripts such as Arabic, Chinese, Cyrillic, Hebrew,
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| 75 | Japanese, and Korean.<a id="DOCF1" href="#FOOT1"><sup>1</sup></a>
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| 76 | </p>
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| 77 | <p>In C source code, non-ASCII characters are valid in comments, in wide
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| 78 | character constants (see <a href="Wide-Character-Constants.html">Wide Character Constants</a>), and in string
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| 79 | constants (see <a href="String-Constants.html">String Constants</a>).
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| 80 | </p>
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| 81 | <p>Another way to specify non-ASCII characters in constants (character or
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| 82 | string) and identifiers is with an escape sequence starting with
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| 83 | backslash, specifying the intended Unicode character. (See <a href="Unicode-Character-Codes.html">Unicode Character Codes</a>.) This specifies non-ASCII characters without
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| 84 | putting a real non-ASCII character in the source file itself.
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| 85 | </p>
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| 86 | <p>C accepts two-character aliases called <em>digraphs</em> for certain
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| 87 | characters. See <a href="Digraphs.html">Digraphs</a>.
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| 88 | </p>
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| 89 | <div class="footnote">
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| 90 | <hr>
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| 91 | <h4 class="footnotes-heading">Footnotes</h4>
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| 92 |
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| 93 | <h5><a id="FOOT1" href="#DOCF1">(1)</a></h3>
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| 94 | <p>On some obscure systems, GNU C uses
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| 95 | UTF-EBCDIC instead of UTF-8, but that is not worth describing in this
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| 96 | manual.</p>
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| 97 | </div>
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| 98 |
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| 99 |
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| 100 |
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| 101 | </body>
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| 102 | </html>
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