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| 22 | <title>Unicode Character Codes (GNU C Language Manual)</title>
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| 23 |
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| 24 | <meta name="description" content="Unicode Character Codes (GNU C Language Manual)">
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| 32 | <link href="Constants.html" rel="up" title="Constants">
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| 55 | </head>
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| 56 |
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| 57 | <body lang="en">
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| 58 | <span id="Unicode-Character-Codes"></span><div class="header">
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| 59 | <p>
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| 60 | Next: <a href="Wide-Character-Constants.html" accesskey="n" rel="next">Wide Character Constants</a>, Previous: <a href="UTF_002d8-String-Constants.html" accesskey="p" rel="prev">UTF-8 String Constants</a>, Up: <a href="Constants.html" accesskey="u" rel="up">Constants</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="Unicode-Character-Codes-1"></span><h3 class="section">12.9 Unicode Character Codes</h3>
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| 64 | <span id="index-Unicode-character-codes"></span>
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| 65 | <span id="index-universal-character-names"></span>
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| 66 |
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| 67 | <p>You can specify Unicode characters, for individual character constants
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| 68 | or as part of string constants (see <a href="String-Constants.html">String Constants</a>), using
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| 69 | escape sequences. Use the ‘<samp>\u</samp>’ escape sequence with a 16-bit
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| 70 | hexadecimal Unicode character code. If the code value is too big for
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| 71 | 16 bits, use the ‘<samp>\U</samp>’ escape sequence with a 32-bit hexadecimal
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| 72 | Unicode character code. (These codes are called <em>universal
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| 73 | character names</em>.) For example,
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| 74 | </p>
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| 75 | <div class="example">
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| 76 | <pre class="example">\u6C34 /* <span class="roman">16-bit code (UTF-16)</span> */
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| 77 | \U0010ABCD /* <span class="roman">32-bit code (UTF-32)</span> */
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| 78 | </pre></div>
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| 79 |
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| 80 | <p>One way to use these is in UTF-8 string constants (see <a href="UTF_002d8-String-Constants.html">UTF-8 String Constants</a>). For instance,
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| 81 | </p>
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| 82 | <div class="example">
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| 83 | <pre class="example">u8"fóó \u6C34 \U0010ABCD"
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| 84 | </pre></div>
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| 85 |
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| 86 | <p>You can also use them in wide character constants (see <a href="Wide-Character-Constants.html">Wide Character Constants</a>), like this:
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| 87 | </p>
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| 88 | <div class="example">
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| 89 | <pre class="example">u'\u6C34' /* <span class="roman">16-bit code</span> */
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| 90 | U'\U0010ABCD' /* <span class="roman">32-bit code</span> */
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| 91 | </pre></div>
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| 92 |
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| 93 | <p>and in wide string constants (see <a href="Wide-String-Constants.html">Wide String Constants</a>), like
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| 94 | this:
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| 95 | </p>
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| 96 | <div class="example">
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| 97 | <pre class="example">u"\u6C34\u6C33" /* <span class="roman">16-bit code</span> */
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| 98 | U"\U0010ABCD" /* <span class="roman">32-bit code</span> */
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| 99 | </pre></div>
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| 100 |
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| 101 | <p>Codes in the range of <code>D800</code> through <code>DFFF</code> are not valid
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| 102 | in Unicode. Codes less than <code>00A0</code> are also forbidden, except for
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| 103 | <code>0024</code>, <code>0040</code>, and <code>0060</code>; these characters are
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| 104 | actually ASCII control characters, and you can specify them with other
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| 105 | escape sequences (see <a href="Character-Constants.html">Character Constants</a>).
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| 106 | </p>
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| 107 |
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| 108 |
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