[ Arithmetic | The ECLiPSe Built-In Predicates | Reference Manual | Alphabetic Index ]
# /(+Number1, +Number2, -Result)

Evaluates the quotient Number1 / Number2 and unifies the resulting value
with Result.
*Number1*
- A number.
*Number2*
- A number.
*Result*
- A variable or float (resp. rational).

## 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 type of the division depends on the value of the global flag
prefer_rationals. When it is off, the result is a float,
when it is on, the result is a rational. 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).
*(5) type error *
- Result is a number but not a float (resp. rational).
*(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:
/(10, 2, 5.0).
/(10, -2.0, -5.0).
/(9, 12, 3_4). (with set_flag(prefer_rationals, on))
Fail:
/(1, 2, 1.0).
Error:
/(A, 2, 6.0). (Error 4).
/(5, 2, r). (Error 5).
/(6, 2, 3). (Error 5).
/(2, 0, Result). (Error 20).
/(4 + 2, 2, 12). (Error 24).

## See Also

is / 2, get_flag / 2, set_flag / 2