CODEWITHSUNDEEP
scala
Jwan622
Jwan622

Reputation: 11639

Rounding in Scala and division

I have some Scala division code like this:

order.price.toBigDecimal.round(MathContext.DECIMAL128) / order.subPrice.toBigDecimal).toString

That does not work. It throws me this error:

java.lang.ArithmeticException: Non-terminating decimal expansion; no exact representable decimal result.

I wrote this in return, but it does not round. It gives me a number like this: 9.8431984893148934

order.price.toBigDecimal.setScale(2, BigDecimal.RoundingMode.HALF_UP).toDouble / order.subPrice.toBigDecimal.setScale(2, BigDecimal.RoundingMode.HALF_UP).toDouble

What can I do if the number I want returned from this division to have only two decimal places?

Upvotes: 1

Views: 932

Answers (1)

oowekyala
oowekyala

Reputation: 7748

Your expression

order.price.toBigDecimal.setScale(2, BigDecimal.RoundingMode.HALF_UP).toDouble / order.subPrice.toBigDecimal.setScale(2, BigDecimal.RoundingMode.HALF_UP).toDouble

is basically a division of a Double by a Double, which gives back a Double with the exact result. I think what you're after might be

(order.price / order.subPrice).toBigDecimal.setScale(2, BigDecimal.RoundingMode.HALF_UP).toDouble

which produces a number with 2 decimal places. Notice we round the result of the division and not the operands, so as not to lose precision.

Upvotes: 4

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