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+(+Number1, +Number2, -Result)
Evaluates the sum Number1 + Number2 and unifies the resulting value with
Result.
- Number1
- A number.
- Number2
- A number.
- Result
- Output: a number.
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
Exceptions
- (4) instantiation fault 
- Number1 or Number2 is not instantiated (non-coroutining mode    only).
- (24) number expected 
- 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