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+(+Number1, +Number2, -Result)
-Result is +Number1 + +Number2
Evaluates the sum Number1 + Number2 and unifies the resulting value with
Result.
- Number1
- A number.
- Number2
- A number.
- Result
- Output: a number.
Description
Evaluates the sum Number1 + Number2 and unifies the resulting value with
Result.
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.
This predicate can be used as a function in arithmetic expressions.
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