Performs a unary operation that returns the negative value of a numeric expression.
执行一元运算，返回数值表达式的负值。
A UML operation representing a binary operator is named similarly to unary operator, but the symbol is one of the binary operators.
表示双目运算符(binaryoperator)的UML操作的命名方式类似于单目运算符，但符号是双目运算符之一。
A return type and a single parameter are set for UML operation that represents a unary operator.
表示单目运算符的UML操作还设置有返回类型和一个参数。
Unary operators perform an operation on a single operand, such as returning the negative or positive value of a numeric expression.
一元运算符对单个操作数执行操作，如返回数值表达式的负值或正值。
Unary operators perform an operation on a single operand, such as returning the negative or positive value of a numeric expression.
一元运算符对单个操作数执行操作，如返回数值表达式的负值或正值。
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