[ Arithmetic | Reference Manual | Alphabetic Index ]
Unifies the negative of Number with Result.
- A number.
- Output: a number.
This predicate is used by the ECLiPSe compiler to expand evaluable
arithmetic expressions. So the call to -(Number, Result) is equivalent
Result is -Number
which should be preferred for portability.
Result is the negative of Number.
In coroutining mode, if Number is uninstantiated, the call to -/2 is
delayed until this variable is instantiated.
Modes and Determinism
- (4) instantiation fault
- Number is not instantiated (non-coroutining mode only).
- (24) number expected
- Number is not of a numeric type.
Result is - 1. % gives Result = -1
Result is - 5. % gives Result = -5
Result is - -6.2. % gives Result = 6.2
Result is -(1). % gives Result = -1
Result is -(5). % gives Result = -5
Result is -(-6.2). % gives Result = 6.2
is / 2