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--
subject			fact

--	has purpose to decrement its operand by one
	is a subtopic of Operators
	is an instance of arithmetic operator
	is an instance of postfix operator
	is an instance of prefix operator
	is an instance of unary operator
	can be used in prefix or postfix form
	has example example expression equivalent longer expression a--; b=a--; --a; b=--a; a=a-1; b=a; a=a-1; a=a-1; a=a-1; b=a;
unary operator	if a unary operator uses a postfix notation then the unary operator appears after its operand
	if a unary operator uses a prefix notation then the unary operator appears before its operand
operator	evaluates to its result
	has precedence
	is part of an expression
	is evaluated before another operator with lower precedence
	returns a value called its result
syntactic unit	has syntax rule bold = mandatory italic = non-terminal normal font = optional

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