Ranges in Kotlin using data type Double

Question

    fun calcInterest(amount: Double, interest: Double): Double {
    return(amount *(interest/100.0))
}

fun main(args: Array) {

    for (i in 1.0..2.         


        

Answer 1

As of Kotlin 1.1, a ClosedRange "cannot be used for iteration" (rangeTo() - Utility functions - Ranges - Kotlin Programming Language).

You can, however, define your own step extension function for this. e.g.:

infix fun ClosedRange.step(step: Double): Iterable {
    require(start.isFinite())
    require(endInclusive.isFinite())
    require(step > 0.0) { "Step must be positive, was: $step." }
    val sequence = generateSequence(start) { previous ->
        if (previous == Double.POSITIVE_INFINITY) return@generateSequence null
        val next = previous + step
        if (next > endInclusive) null else next
    }
    return sequence.asIterable()
}

Although you can do this if you are working with money you shouldn't really be using Double (or Float). See Java Practices -> Representing money.