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 nonzero and thus treated as TRUE.
Other operations at the bit level, which are not normally described as "bitwise"
include shift and rotate.
(19950512)
Nearby terms:
bit stuffing « bit twiddling « bitty box «
bitwise » bitwise complement » bixie » bizcore
stability
