Error: unresolved reference: roundToInt

Question

I am trying to use roundToInt() to convert double value into rounded integer but I am getting Unresolved Reference exception.

I am going through the official documentation of Kottlin still no luck.

Code:

Edit 1:

fun solve(meal_cost: Double, tip_percent: Int, tax_percent: Int): Unit {
    var tip = (meal_cost *tip_percent)/100
    var tax = (meal_cost *tax_percent)/100
    var totalCost = (tip+tax+meal_cost).roundToInt()

    System.out.println("The total cost is "+totalCost+".")
}

Error Log:

Solution.kt:25:41: error: unresolved reference: roundToInt
var totalCost = (tip+tax+meal_cost).roundToInt()
                                    ^   

Answer 1

You need to import this function.

import kotlin.math.roundToInt

roundToInt() is an extension function provided by the math package and not a member function of Double.