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103 lines
4.3 KiB
HTML
103 lines
4.3 KiB
HTML
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<title>Binary constants (Using the GNU Compiler Collection (GCC))</title>
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<a name="Binary-constants"></a>
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<p>
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Previous: <a href="Thread_002dLocal.html#Thread_002dLocal" accesskey="p" rel="prev">Thread-Local</a>, Up: <a href="C-Extensions.html#C-Extensions" accesskey="u" rel="up">C Extensions</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Binary-Constants-using-the-0b-Prefix"></a>
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<h3 class="section">6.64 Binary Constants using the ‘<samp>0b</samp>’ Prefix</h3>
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<a name="index-Binary-constants-using-the-0b-prefix"></a>
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<p>Integer constants can be written as binary constants, consisting of a
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sequence of ‘<samp>0</samp>’ and ‘<samp>1</samp>’ digits, prefixed by ‘<samp>0b</samp>’ or
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‘<samp>0B</samp>’. This is particularly useful in environments that operate a
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lot on the bit level (like microcontrollers).
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</p>
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<p>The following statements are identical:
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</p>
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<div class="smallexample">
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<pre class="smallexample">i = 42;
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i = 0x2a;
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i = 052;
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i = 0b101010;
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</pre></div>
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<p>The type of these constants follows the same rules as for octal or
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hexadecimal integer constants, so suffixes like ‘<samp>L</samp>’ or ‘<samp>UL</samp>’
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can be applied.
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</p>
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