how to set the scale like BigDecimal

[Rocky-Hu]

 Expression expression = new Expression("a- b");
        expression
                .with("a","480.70")
                .and("b","480.99");
BigDecimal c=  expression.eval();

The result is -0.29. I want is -0.290, and set the precision is not working.

like BigDecimal:

BigDecimal a= new BigDecimal("480.70");
BigDecimal b= new BigDecimal("480.99");
BigDecimal c= a.subtract(b).setScale(3);

Is there any way ?

[RobertZenz]

Yes, eval() strips the zeroes f the BigDecimal result by default. However, you missed that there is the eval(boolean) overload which allows you to disable that behavior.

[uklimaschewski]

With version 3, stripping trailing zeroes can be configured, but I see that it isn't in the documentation.
Leaving this open, though it is fixed to remind adding the documentation.

[uklimaschewski]

Documentation is here: https://ezylang.github.io/EvalEx/configuration/configuration.html