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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

Expressions with Unary Operators

Unary operators act on only one operand in an expression. The unary operators are:

These operators have right-to-left associativity. Unary expressions generally involve syntax that precedes a postfix or primary expression.

The following are the possible forms of unary expressions:


        postfix-expression
++unary-expression
––unary-expression
unary-operator cast-expression
sizeof .unary-expression
sizeof ( type-name )
allocation-expression
deallocation-expression

The unary-operator may be one of


        * & + – ! ~

Any postfix expression is considered a unary expression, and since any primary expression is considered a postfix expression, all primary expressions are considered unary expressions as well. For more information, see Postfix Expressions and Primary Expressions.

The allocation-expression refers to the new operator. The deallocation-expression refers to the delete operator. See the links above.

The cast-expression is a unary expression with an optional cast to alter the type. For more information see Cast Operator: ().

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