Kotlin Program to Display Prime Numbers Between Two Intervals

In this program, you'll learn to display prime numbers between two given intervals, low and high. You'll learn to do this using a while and a for loop in Kotlin.

Example: Display Prime Numbers Between two Intervals

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

    while (low < high) {
        var flag = false

        for (i in 2..low / 2) {
            // condition for nonprime number
            if (low % i == 0) {
                flag = true
                break
            }
        }

        if (!flag)
            print("$low ")

        ++low
    }
}

When you run the program, the output will be:

23 29 31 37 41 43 47 

In this program, each number between low and high are tested for prime. The inner for loop checks whether the number is prime or not.

You can check: Kotlin Program to Check Prime Number for more explanation.

The difference between checking a single prime number compared to an interval is, you need to reset the value of flag = false on each iteration of while loop.