Kotlin Program to Display Prime Numbers Between Intervals Using Function

fun main(args: Array<String>) {
    var low = 20
    val high = 50

    while (low < high) {
        if (checkPrimeNumber(low))
            print(low.toString() + " ")

        ++low
    }
}

fun checkPrimeNumber(num: Int): Boolean {
    var flag = true

    for (i in 2..num / 2) {

        if (num % i == 0) {
            flag = false
            break
        }
    }

    return flag
}
 

Output:

23 29 31 37 41 43 47