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| 31 | <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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| 32 | <link href="Integer-Types.html" rel="up" title="Integer Types">
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| 58 | <span id="Basic-Integers"></span><div class="header">
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| 59 | <p>
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| 60 | Next: <a href="Signed-and-Unsigned-Types.html" accesskey="n" rel="next">Signed and Unsigned Types</a>, Up: <a href="Integer-Types.html" accesskey="u" rel="up">Integer Types</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="Basic-Integers-1"></span><h4 class="subsection">11.1.1 Basic Integers</h4>
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| 64 |
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| 65 | <span id="index-char"></span>
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| 66 | <span id="index-int"></span>
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| 67 | <span id="index-short-int"></span>
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| 68 | <span id="index-long-int"></span>
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| 69 | <span id="index-long-long-int"></span>
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| 70 |
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| 71 | <p>Integer data types in C can be signed or unsigned. An unsigned type
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| 72 | can represent only positive numbers and zero. A signed type can
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| 73 | represent both positive and negative numbers, in a range spread almost
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| 74 | equally on both sides of zero.
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| 75 | </p>
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| 76 | <p>Aside from signedness, the integer data types vary in size: how many
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| 77 | bytes long they are. The size determines how many different integer
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| 78 | values the type can hold.
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| 79 | </p>
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| 80 | <p>Here’s a list of the signed integer data types, with the sizes they
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| 81 | have on most computers. Each has a corresponding unsigned type; see
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| 82 | <a href="Signed-and-Unsigned-Types.html">Signed and Unsigned Types</a>.
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| 83 | </p>
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| 84 | <dl compact="compact">
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| 85 | <dt><code>signed char</code></dt>
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| 86 | <dd><p>One byte (8 bits). This integer type is used mainly for integers that
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| 87 | represent characters, as part of arrays or other data structures.
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| 88 | </p>
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| 89 | </dd>
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| 90 | <dt><code>short</code></dt>
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| 91 | <dt><code>short int</code></dt>
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| 92 | <dd><p>Two bytes (16 bits).
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| 93 | </p>
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| 94 | </dd>
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| 95 | <dt><code>int</code></dt>
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| 96 | <dd><p>Four bytes (32 bits).
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| 97 | </p>
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| 98 | </dd>
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| 99 | <dt><code>long</code></dt>
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| 100 | <dt><code>long int</code></dt>
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| 101 | <dd><p>Four bytes (32 bits) or eight bytes (64 bits), depending on the
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| 102 | platform. Typically it is 32 bits on 32-bit computers
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| 103 | and 64 bits on 64-bit computers, but there are exceptions.
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| 104 | </p>
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| 105 | </dd>
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| 106 | <dt><code>long long</code></dt>
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| 107 | <dt><code>long long int</code></dt>
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| 108 | <dd><p>Eight bytes (64 bits). Supported in GNU C in the 1980s, and
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| 109 | incorporated into standard C as of ISO C99.
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| 110 | </p></dd>
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| 111 | </dl>
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| 112 |
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| 113 | <p>You can omit <code>int</code> when you use <code>long</code> or <code>short</code>.
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| 114 | This is harmless and customary.
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| 115 | </p>
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| 116 |
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| 117 |
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| 118 |
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| 119 | </body>
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