Previous: Thread-Local, Up: C Extensions

### 6.62 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.