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74 lines
3.2 KiB
HTML
74 lines
3.2 KiB
HTML
4 years ago
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<title>Binary constants - Using the GNU Compiler Collection (GCC)</title>
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<link rel="up" href="C-Extensions.html#C-Extensions" title="C Extensions">
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A GNU Manual
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<a name="Binary-constants"></a>
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<p>
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Previous: <a rel="previous" accesskey="p" href="Thread_002dLocal.html#Thread_002dLocal">Thread-Local</a>,
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Up: <a rel="up" accesskey="u" href="C-Extensions.html#C-Extensions">C Extensions</a>
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</div>
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<h3 class="section">6.63 Binary Constants using the ‘<samp><span class="samp">0b</span></samp>’ Prefix</h3>
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<p><a name="index-Binary-constants-using-the-_0040samp_007b0b_007d-prefix-4196"></a>
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Integer constants can be written as binary constants, consisting of a
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sequence of ‘<samp><span class="samp">0</span></samp>’ and ‘<samp><span class="samp">1</span></samp>’ digits, prefixed by ‘<samp><span class="samp">0b</span></samp>’ or
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‘<samp><span class="samp">0B</span></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>The following statements are identical:
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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>
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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><span class="samp">L</span></samp>’ or ‘<samp><span class="samp">UL</span></samp>’
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can be applied.
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