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Unary

A unary expression returns different results depending on which of the unary operators is used.

 

Expression	Character representation	Returns
Unary	-	The arithmetic negation of the operand, or null if the operand is null.
	+	The arithmetic value of the operand (unchanged), or null if its operand is null.
	not	The logical negation of the operand.

Note:

The arithmetic negation of a null operand yields the result null, whereas the logical negation of a null operand yields the Boolean result true. This is justified by the common sense statement: If null means nothing, then “not nothing” should be something.

These are examples of using the unary expression:

 

Expression	Returns
-(17)	-17
-(-17)	17
+(17)	17
+(-17)	-17
not(“true”)	1 (true)
not(1)	0 (false)

Unary