
+(+Number1, +Number2, -Result)

   Evaluates the sum Number1 + Number2 and unifies the resulting value with
Result.



Arguments
   Number1             A number.
   Number2             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 +(Number1, Number2, Result) is
   equivalent to

    Result is Number1 + Number2

    which should be preferred for portability.

   The result is of type breal if any of the arguments is a breal,
   else float if any of the arguments is a float, else rational if any
   of the arguments is a rational.  Only when both arguments are
   integers is the result an integer.


   In coroutining mode, if Number1 or Number2 are uninstantiated, the call
   to +/3 is delayed until these variables are instantiated.




Modes and Determinism
   +(+, +, -) is det

Exceptions
     4 --- Number1 or Number2 is not instantiated (non-coroutining mode    only).
    24 --- Number1 or Number2 is not of a numeric type.

Examples
   
Success:
    Result is 5 + 2.		% gives Result = 7
    Result is 5 + -2.0.		% gives Result = 3.0


See Also
   is / 2
