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# \(+Number, -Result)

Evaluates the bitwise complement of Number and unifies the resulting value with Result.

Number
  Integer.
Result
  Output: integer.

## Description

This predicate is used by the ECLiPSe compiler to expand evaluable arithmetic expressions. So the call to \(Number, Result) is equivalent to

        Result is \Number

which should be preferred for portability.

This operation behaves as if operating on an unlimited length two's complement representation.

In coroutining mode, if Number is uninstantiated, the call to \/2 is delayed until this variable is instantiated.

### Modes and Determinism

- \(+, -) is det

### Exceptions

(4) instantiation fault
  Number is not instantiated (non-coroutining mode only).
(5) type error
  Number is a number but not an integer.
(24) number expected
  Number is not of a numeric type.

## Examples

    Success:
         Result is \1.		% gives Result = -2
         Result is \5.		% gives Result = -6
         Result is \ -6.		% gives Result = 5

    Error:
         Result is \0.0.           % type error

## See Also

is / 2