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breal(+Number, -Result)
Converts Number into a breal number and unifies it with Result.
- Number
- A number.
- Result
- A variable or bounded real number.
Description
This predicate is used by the ECLiPSe compiler to expand evaluable
arithmetic expressions. So the call to breal(Number, Result) is
equivalent to
Result is breal(Number)
which should be preferred.
Modes and Determinism
Exceptions
- (4) instantiation fault
- Number is not instantiated (non-coroutining mode only).
- (24) number expected
- Number is not of a numeric type.
Examples
Success:
?- breal(25, X).
X = 25.0__25.0
?- breal(1.5, X).
X = 1.5__1.5
?- breal(3_4, X).
X = 0.74999999999999989__0.75000000000000011
?- breal(1.0__1.01, X).
X = 1.0__1.01
Fail:
?- breal(1.0, 0.9__1.1).
No (0.00s cpu)
?- breal(3, 3).
No (0.00s cpu)
?- breal(1, r).
No (0.00s cpu)
Error:
?- breal(A, X).
instantiation fault in breal(A, X)
?- breal(4 + 2, X).
number expected in breal(4 + 2, X)
See Also
integer / 2, float / 2, rational / 2, is / 2, breal_min / 2, breal_max / 2, breal_bounds / 3, breal_from_bounds / 3, breal / 1