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+<div class="section-level-extent" id="Binary-constants"> <div class="nav-panel"> <p> Previous: <a href="thread-local" accesskey="p" rel="prev">Thread-Local Storage</a>, Up: <a href="c-extensions" accesskey="u" rel="up">Extensions to the C Language Family</a> [<a href="index#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="indices" title="Index" rel="index">Index</a>]</p> </div>  <h1 class="section" id="Binary-Constants-using-the-0b-Prefix"><span>6.65 Binary Constants using the ‘<samp class="samp">0b</samp>’ Prefix<a class="copiable-link" href="#Binary-Constants-using-the-0b-Prefix"> ¶</a></span></h1>  <p>Integer constants can be written as binary constants, consisting of a sequence of ‘<samp class="samp">0</samp>’ and ‘<samp class="samp">1</samp>’ digits, prefixed by ‘<samp class="samp">0b</samp>’ or ‘<samp class="samp">0B</samp>’. This is particularly useful in environments that operate a lot on the bit level (like microcontrollers). </p> <p>The following statements are identical: </p> <div class="example smallexample"> <pre class="example-preformatted" data-language="cpp">i =       42;
+i =     0x2a;
+i =      052;
+i = 0b101010;</pre>
+</div> <p>The type of these constants follows the same rules as for octal or hexadecimal integer constants, so suffixes like ‘<samp class="samp">L</samp>’ or ‘<samp class="samp">UL</samp>’ can be applied. </p> </div><div class="_attribution">
+  <p class="_attribution-p">
+    &copy; Free Software Foundation<br>Licensed under the GNU Free Documentation License, Version 1.3.<br>
+    <a href="https://gcc.gnu.org/onlinedocs/gcc-13.1.0/gcc/Binary-constants.html" class="_attribution-link">https://gcc.gnu.org/onlinedocs/gcc-13.1.0/gcc/Binary-constants.html</a>
+  </p>
+</div>