Kotlin Essential Training

Chapter 5 - Section 2

	fun main(args: Array<String>) {
		try {
			val mathLib = MathLib()
			while (true) {
				val number = MathLib.getInput("Enter a number: ")
				mathLib.addValue(number)
				println("Current total: ${mathLib.runningTotal}")
			}
		} catch (e: NumberFormatException) {
			println("${e.message} is not a number")
		} catch (e: Exception) {
			println(e.message)
		}
	}

	class MathLib {

		var runningTotal = 0.0

		fun addValue(value: Double) {
			runningTotal += value
		}

		companion object {
			fun addValues(number1: Double, number2: Double) = number1 + number2

			fun getInput(prompt: String): Double {
				print(prompt)
				val string: String? = readLine()
				val number = string!!.toBigDecimal()
				return number.toDouble()
			}
		}
	}