how to divide two integer into decimal in kotlin?

Question

i divide two Integers (e.x 3/6) and i'm trying to get a result of 0.500000 in kotlin. i've tried some solutions but none of them solve my problem like.

val num = BigDecimal(3.div(6))      println("%.6f".format(num))      

but the result is 0.000000

Answer 1

3 and 6 are both Int, and dividing one Int by another gives an Int: that's why you get back 0. To get a non-integer value you need to get the result of the division to be a non-integer value. One way to do this is convert the Int to something else before dividing it, e.g.:

val num = 3.toDouble() / 6 

num will now be a Double with a value of 0.5, which you can format as a string as you wish.

Answer 2

You might have better luck with:

val num = 3.toBigDecimal().divide(6.toBigDecimal()) println(num) // prints 0.5 

You have to convert both numbers to BigDecimal for the method to work. This will show the exact quotient, or throw an exception if the exact quotient cannot be represented (ie a non-terminating decimal).

You can set the scale and rounding mode as follows:

val num = 3.toBigDecimal().divide(6.toBigDecimal(), 4, RoundingMode.HALF_UP) println(num) // prints 0.5000 

Link to reference article