[ Arithmetic | The ECLiPSe Built-In Predicates | Reference Manual | Alphabetic Index ]
//(+Number1, +Number2, ?Result)
Evaluates the integer quotient Number1 // Number2 and unifies the resulting
value with Result.
- +Number1
- Integer.
- +Number2
- Integer.
- ?Result
- A variable or integer.
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.
In coroutining mode, if Number1 or Number2 are free variables, the call
to (//)/3 is delayed until these variables are instantiated.
Fail Conditions
Fails if the result of the evaluation does not unify with Result.
Resatisfiable
No
Exceptions
- (4) instantiation fault
- Number1 or Number2 is not instantiated (non-coroutining mode only).
- (5) type error
- Number1 or Number2 is a number but not an integer.
- (5) type error
- Result is a number but not an integer.
- (24) number expected
- Number1 or Number2 is not of a numeric type.
- (24) number expected
- Result is neither a number nor a variable.
- (20) arithmetic exception
- Illegal arithmetic operation: division by 0
Examples
Success:
//(11, 2, 5).
//(11, -2, -5).
Fail:
//(1, 2, 3).
Error:
//(A, 2, 6). (Error 4).
//(5, 2, r). (Error 5).
//(6, 2.0, 3.0). (Error 5).
//(2, 0, Result). (Error 20).
//(4 + 2, 2, 12). (Error 24).
See Also
is / 2