Precision on result

[nicolas-eveno]

I don't know if it's a bug but I don't understand why exp4j gives this result.
249 * 0.595 = 249.305
BigDecimal.valueOf(419).multiply(BigDecimal.valueOf(0.595));
This give 249.305 too. I wait same with exp4j

Now with exp4j:
new ExpressionBuilder(regle).variable("d").variables("d").build().setVariable("d", 419).evaluate();
I obtain 249.30499999999998.

Do you know what is wrong?

[RobertZenz]

Yeah, read up about floating-point precision. In short, float and double is, mostly, an approximation of values.

[nicolas-eveno]

Yes I think too. It's bad me. Using Double is not a good thing in my app. Do you know an alternative with this lib or other?

[RobertZenz]

There is EvalEx which is similar and uses BigDecimals...and before you ask look at EvalEx#114.

[nicolas-eveno]

Thank you. I try it.