[ Arithmetic | The ECLiPSe Built-In Predicates | Reference Manual | Alphabetic Index ]

ceiling(+Number, ?Result)

Unifies Result with the least integral value that is greater than or equal to Number and of the same numeric type as Number.
+Number
A number.
?Result
A variable or number.

Description

This predicate is used by the ECLiPSe compiler to expand evaluable arithmetic expressions. So the call to ceiling(Number, Result) is equivalent to 
    Result is ceiling(Number)
which should be preferred.

In coroutining mode, if Number is a free variable, the call to ceiling/2 is delayed until this variable is instantiated.

Fail Conditions

Fails if the result of the evaluation does not unify with Result.

Resatisfiable

No

Exceptions

(4) instantiation fault
Number is not instantiated (non-coroutining mode only).
(5) type error
Result and Number are numbers of different types.
(24) number expected
Number is not of a numeric type.
(24) number expected
Result is neither a number nor a variable.

Examples

Success:
      ceiling(1.8, 2.0).
      ceiling(-1.8, -1.0).
      ceiling(5, 5).
      ceiling(-6.4, Result).      (gives Result = -6.0)
Fail:
      ceiling(0.0, 1.0).
Error:
      ceiling(A, 6.0).                   (Error 4).
      ceiling(0.5, 0).                   (Error 5).
      ceiling(1, r).                     (Error 24).
      ceiling(4 + 2.3, 6.0).             (Error 24).

See Also

is / 2, floor / 2