Convert Decimal to Binary and Vice Versa in Kotlin

Converter.kt

package com.thecodevs.Converter

import com.thecodevs.Math.*

fun toDecimal(binaryNumber : String) : Int {
    var sum = 0
    binaryNumber.reversed().forEachIndexed {
        k, v -> sum += v.toString().toInt() * pow(2, k)
    }
    return sum
}

fun toBinary(decimalNumber: Int, binaryString: String = "") : String {
    while (decimalNumber > 0) {
        val temp = "${binaryString}${decimalNumber%2}"
        return toBinary(decimalNumber/2, temp)
    }
    return binaryString.reversed()
}

Main.kt

import com.thecodevs.Converter.*

fun main(args: Array<String>) {
    println(toDecimal("10011011"))
    println(toBinary(155))
}

Math.kt

package com.thecodevs.Math

import java.lang.Math

fun pow(base: Int, exponent: Int) = Math.pow(base.toDouble(), exponent.toDouble()).toInt()