- operator works exactly as one would expect, it changes the postive/negative aspect of a number without changing its magnitude. For zero, which has neither a positive aspect nor a negative aspect, unary
- yields zero. So, for any number apart from 0, unary
- gives a result which is different from the operand.
This operator is in the unary precedence group, which is the highest. This means all unary operators are evaluated before any others, e.g. addition, so
-7+2 is evaluated as
(-7)+2. Since all unary operators are prefixes to their operands, they are right-associative, i.e. the rightmost ones are evaluated first.