In Boolean algebra, the logical complement or negation of a Boolean value is the opposite value, given by the following truth table:A | -A --+--- T | F F | T-A is also written as A with a bar over it or with a small vertical line hanging from the right-hand end of the "-" (LaTeX
eg) or as A' .In the C programming language, it is !A and in digital circuit design, /A.(1995-01-24)