[ Arithmetic | The ECLiPSe Built-In Predicates | Reference Manual | Alphabetic Index ]
# \(+Number, -Result)

Evaluates the bitwise complement of Number and unifies the resulting value
with Result.
*Number*
- Integer.
*Result*
- A variable or 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

### Exceptions

*(4) instantiation fault *
- Number is not instantiated (non-coroutining mode only).
*(5) type error *
- Result is a number but not an integer.
*(5) type error *
- Number is a number but not an integer.
*(24) number expected *
- Number is not of a numeric type.
*(24) number expected *
- Result is neither a number nor a variable.

## Examples

Success:
\(1, -2).
\(5, Result). (gives Result = -6)
\(-6, Result). (gives Result = 5)
Fail:
\(1, 0).
Error:
\(A, 6). (Error 4).
\(0.0, 0.0). (Error 5).
\(4 + 2, -7). (Error 24).
\(1, r). (Error 24).

## See Also

is / 2