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| 22 | <title>Integer Const Type (GNU C Language Manual)</title>
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| 31 | <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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| 32 | <link href="Constants.html" rel="up" title="Constants">
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| 33 | <link href="Floating-Constants.html" rel="next" title="Floating Constants">
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| 55 | </head>
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| 57 | <body lang="en">
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| 58 | <span id="Integer-Const-Type"></span><div class="header">
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| 59 | <p>
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| 60 | Next: <a href="Floating-Constants.html" accesskey="n" rel="next">Floating Constants</a>, Previous: <a href="Integer-Constants.html" accesskey="p" rel="prev">Integer 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="Integer-Constant-Data-Types"></span><h3 class="section">12.2 Integer Constant Data Types</h3>
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| 64 | <span id="index-integer-constant-data-types"></span>
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| 65 | <span id="index-constant-data-types_002c-integer"></span>
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| 66 | <span id="index-types-of-integer-constants"></span>
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| 67 |
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| 68 | <p>The type of an integer constant is normally <code>int</code>, if the value
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| 69 | fits in that type, but here are the complete rules. The type
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| 70 | of an integer constant is the first one in this sequence that can
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| 71 | properly represent the value,
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| 72 | </p>
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| 73 | <ol>
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| 74 | <li> <code>int</code>
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| 75 | </li><li> <code>unsigned int</code>
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| 76 | </li><li> <code>long int</code>
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| 77 | </li><li> <code>unsigned long int</code>
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| 78 | </li><li> <code>long long int</code>
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| 79 | </li><li> <code>unsigned long long int</code>
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| 80 | </li></ol>
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| 81 |
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| 82 | <p>and that isn’t excluded by the following rules.
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| 83 | </p>
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| 84 | <p>If the constant has ‘<samp>l</samp>’ or ‘<samp>L</samp>’ as a suffix, that excludes the
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| 85 | first two types (non-<code>long</code>).
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| 86 | </p>
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| 87 | <p>If the constant has ‘<samp>ll</samp>’ or ‘<samp>LL</samp>’ as a suffix, that excludes
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| 88 | first four types (non-<code>long long</code>).
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| 89 | </p>
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| 90 | <p>If the constant has ‘<samp>u</samp>’ or ‘<samp>U</samp>’ as a suffix, that excludes
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| 91 | the signed types.
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| 92 | </p>
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| 93 | <p>Otherwise, if the constant is decimal, that excludes the unsigned
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| 94 | types.
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| 95 | </p>
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| 96 | <p>Here are some examples of the suffixes.
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| 97 | </p>
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| 98 | <div class="example">
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| 99 | <pre class="example">3000000000u // <span class="roman">three billion as <code>unsigned int</code>.</span>
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| 100 | 0LL // <span class="roman">zero as a <code>long long int</code>.</span>
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| 101 | 0403l // <span class="roman">259 as a <code>long int</code>.</span>
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| 102 | </pre></div>
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| 103 |
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| 104 | <p>Suffixes in integer constants are rarely used. When the precise type
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| 105 | is important, it is cleaner to convert explicitly (see <a href="Explicit-Type-Conversion.html">Explicit Type Conversion</a>).
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| 106 | </p>
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| 107 | <p>See <a href="Integer-Types.html">Integer Types</a>.
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| 108 | </p>
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| 109 |
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| 110 |
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| 111 |
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| 112 | </body>
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