Bitwise
<programming> A bitwise operator treats its operands as a
vector of
bits rather than a single number.
Boolean bitwise operators combine bit N of each operand using a
Boolean function (
NOT,
AND,
OR,
XOR) to produce bit N of the result.
For example, a bitwise AND operator ("&" in
C) would evaluate 13 & 9 as (binary) 1101 & 1001 = 1001 = 9, whereas, the logical AND, (
C "&&") would evaluate 13 && 9 as TRUE && TRUE = TRUE = 1.
In some languages, e.g. Acorn's
BASIC V, the same operators are used for both bitwise and logical operations.
This usually works except when applying NOT to a value x which is neither 0 (false) nor -1 (true), in which case both x and (NOT x) will be non-zero and thus treated as TRUE.
Other operations at the bit level, which are not normally described as "bitwise" include shift and rotate.
