The preferred term is bitwise complement. Most computer arithmetic uses two's complement to represent numbers so the complement and the negation of a bit pattern are not the same. Because the two's complement negation of a number is equivalent to the one's complement negation plus 1, the two's complement negation of a single bit number is the same as the original number!

Which all seems a whole lot more pedantic than I really intended, but the notion that negating a number leaves it unchanged was just too neat to pass up :-D.

Premature optimization is the root of all job security

In reply to Re^2: Boolean calculation incorrect values by GrandFather
in thread Boolean calculation incorrect values by Anonymous Monk

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