Gcc/10.2.0/gcc/Binary-constants
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6.65 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.