
-(+Number, -Result)

   Unifies the negative of Number with Result.



Arguments
   Number              A number.
   Result              Output: a number.

Type
   Arithmetic

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.

   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
   -(+, -) is det

Exceptions
     4 --- Number is not instantiated (non-coroutining mode only).
    24 --- Number is not of a numeric type.

Examples
   
    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


See Also
   is / 2
