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