Unary operation

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In mathematics, a unary operation is an operation with only one operand (i.e. an operation with a single input). For instance, logical negation is a unary operation on truth values and squaring is a unary operation on the real numbers. Another unary operation is the factorial, n!. A unary operation on the set S is nothing but a function S → S.

Unary operators (called "monadic" in APL) are also used in programming languages. For example, in the C family of languages, the following operators are unary:

Increment: ++x, x++
Decrement: --x, x--
Address: &x
Indirection: *x
Positive: +x
Negative: -x
One's complement: ~x
Logical negation: !x
Sizeof: sizeof x
Sizeof: sizeof(type-name)
Cast: (type-name) ''cast-expression

Unary operation

See also