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| 22 | <title>Constants (GNU C Language Manual)</title>
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| 33 | <link href="Integer-Constants.html" rel="next" title="Integer Constants">
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| 57 | <body lang="en">
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| 58 | <span id="Constants"></span><div class="header">
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| 59 | <p>
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| 60 | Next: <a href="Type-Size.html" accesskey="n" rel="next">Type Size</a>, Previous: <a href="Primitive-Types.html" accesskey="p" rel="prev">Primitive Types</a>, Up: <a href="index.html" accesskey="u" rel="up">Top</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="Constants-1"></span><h2 class="chapter">12 Constants</h2>
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| 64 | <span id="index-constants"></span>
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| 65 |
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| 66 | <p>A <em>constant</em> is an expression that stands for a specific value by
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| 67 | explicitly representing the desired value. C allows constants for
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| 68 | numbers, characters, and strings. We have already seen numeric and
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| 69 | string constants in the examples.
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| 70 | </p>
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| 71 | <table class="menu" border="0" cellspacing="0">
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| 72 | <tr><td align="left" valign="top">• <a href="Integer-Constants.html" accesskey="1">Integer Constants</a></td><td> </td><td align="left" valign="top">Literal integer values.
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| 73 | </td></tr>
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| 74 | <tr><td align="left" valign="top">• <a href="Integer-Const-Type.html" accesskey="2">Integer Const Type</a></td><td> </td><td align="left" valign="top">Types of literal integer values.
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| 75 | </td></tr>
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| 76 | <tr><td align="left" valign="top">• <a href="Floating-Constants.html" accesskey="3">Floating Constants</a></td><td> </td><td align="left" valign="top">Literal floating-point values.
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| 77 | </td></tr>
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| 78 | <tr><td align="left" valign="top">• <a href="Imaginary-Constants.html" accesskey="4">Imaginary Constants</a></td><td> </td><td align="left" valign="top">Literal imaginary number values.
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| 79 | </td></tr>
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| 80 | <tr><td align="left" valign="top">• <a href="Invalid-Numbers.html" accesskey="5">Invalid Numbers</a></td><td> </td><td align="left" valign="top">Avoiding preprocessing number misconceptions.
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| 81 | </td></tr>
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| 82 | <tr><td align="left" valign="top">• <a href="Character-Constants.html" accesskey="6">Character Constants</a></td><td> </td><td align="left" valign="top">Literal character values.
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| 83 | </td></tr>
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| 84 | <tr><td align="left" valign="top">• <a href="String-Constants.html" accesskey="7">String Constants</a></td><td> </td><td align="left" valign="top">Literal string values.
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| 85 | </td></tr>
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| 86 | <tr><td align="left" valign="top">• <a href="UTF_002d8-String-Constants.html" accesskey="8">UTF-8 String Constants</a></td><td> </td><td align="left" valign="top">Literal UTF-8 string values.
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| 87 | </td></tr>
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| 88 | <tr><td align="left" valign="top">• <a href="Unicode-Character-Codes.html" accesskey="9">Unicode Character Codes</a></td><td> </td><td align="left" valign="top">Unicode characters represented
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| 89 | in either UTF-16 or UTF-32.
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| 90 | </td></tr>
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| 91 | <tr><td align="left" valign="top">• <a href="Wide-Character-Constants.html">Wide Character Constants</a></td><td> </td><td align="left" valign="top">Literal characters values larger than 8 bits.
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| 92 | </td></tr>
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| 93 | <tr><td align="left" valign="top">• <a href="Wide-String-Constants.html">Wide String Constants</a></td><td> </td><td align="left" valign="top">Literal string values made up of
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| 94 | 16- or 32-bit characters.
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| 95 | </td></tr>
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| 96 | </table>
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