Kotlin Practice Digit sum question

Question

Please check my code and tell me what is the problem.

fun main(args: Array<String>) {
var num = readLine()!!.toInt()
var sum = 0
while (num == 0){
var i = num % 10
sum = sum + i
num = num - i
num = num / 10
}
println(sum)
}

Example question. 124
Example answer. 7
Output answer. 0

Answer 1

replace "while (num == 0)" by "while (num != 0)" ^^

Answer 2

Condition should be while <num> not equal to zero.
Also, `num = num - i` is not necessary.