[ Arithmetic | Reference Manual | Alphabetic Index ]
Checks if Number is a number and unifies it 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 identical to 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