Binary constants - Using the GNU Compiler Collection (GCC)

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### 5.55 Binary constants using the ``0b`' prefix

Integer constants can be written as binary constants, consisting of a sequence of ``0`' and ``1`' digits, prefixed by ``0b`' or ``0B`'. This is particularly useful in environments that operate a lot on the bit-level (like microcontrollers).

The following statements are identical:

         i =       42;
         i =     0x2a;
         i =      052;
         i = 0b101010;

The type of these constants follows the same rules as for octal or hexadecimal integer constants, so suffixes like ``L`' or ``UL`' can be applied.