In mathematics, a unary operation is an operation with only one operand. 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. Wikibooks Wikiversity has more about this subject: School of Mathematics Wikiquote has a collection of quotations related to: Mathematics Look up Mathematics on Wiktionary, the free dictionary Wikimedia Commons has more media related to: Mathematics Bogomolny, Alexander: Interactive Mathematics Miscellany and Puzzles. ... In mathematics, an operand is one of the inputs of an operator. ... Negation, in its most basic sense, changes the truth value of a statement to its opposite. ... In logic, a truth value, or truth-value, is a value indicating to what extent a statement is true. ... In mathematics, the real numbers are intuitively defined as numbers that are in one-to-one correspondence with the points on an infinite line—the number line. ... In mathematics, the factorial of a natural number n is the product of all positive integers less than and equal to n. ... In mathematics, a set can be thought of as any collection of distinct things considered as a whole. ... In mathematics, a function is a relation, such that each element of a set (the domain) is associated with a unique element of another (possibly the same) set (the codomain, not to be confused with the range). ...

Unary operators are also used in programming languages. For example in the C++ programming language, the following operators are unary: Other listings of programming languages are: Categorical list of programming languages Generational list of programming languages Chronological list of programming languages Note: Esoteric programming languages have been moved to the separate List of esoteric programming languages. ... C++ (pronounced see plus plus, IPA: /siː pləs pləs/) is a general-purpose computer programming language. ...

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

This article discusses a general notion of reference in computing. ... In computer programming, indirection is the ability to reference something using a name, reference, or container instead of the value itself. ... In mathematics, negative numbers in any base are represented in the usual way, by prefixing them with a - sign. ... Negation, in its most basic sense, changes the truth value of a statement to its opposite. ... This article needs to be cleaned up to conform to a higher standard of quality. ...

See also

• Binary operation
• Arity
• Operand
• Operator
• Operator (programming)