float(+Number, -Result)

Converts Number to float and unifies the resulting value with Result.

Description

This predicate is used by the ECLiPSe compiler to expand evaluable arithmetic expressions. So the call to float(Number, Result) is equivalent to

    Result is float(Number)

which should be preferred for portability.

In coroutining mode, if Number is uninstantiated, the call to float/2 is delayed until this variable is instantiated.

(4) instantiation fault: Number is not instantiated (non-coroutining mode only).
(24) number expected: Number is not of a numeric type.

    Result is float(1).		% gives Result = 1.0
    Result is float(-6).	% gives Result = -6.0