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Kotlin example for Beginners – Kotlin Program to Display Armstrong Numbers Between Intervals Using Function

Kotlin Program to Display Armstrong Numbers Between Intervals Using Function

In this program, you’ll learn to display all armstrong numbers between two given intervals, low and high, using a function in Kotlin.

To find all armstrong numbers between two integers, checkArmstrong() function is created.

Example: Armstrong Numbers Between Two Integers

fun main(args: Array<String>) {
    val low = 999
    val high = 99999

    for (number in low + 1..high - 1) {
        if (checkArmstrong(number))
            print("$number ")

fun checkArmstrong(num: Int): Boolean {
    var digits = 0
    var result = 0
    var originalNumber = num

    // number of digits calculation
    while (originalNumber != 0) {
        originalNumber /= 10

    originalNumber = num

    // result contains sum of nth power of its digits
    while (originalNumber != 0) {
        val remainder = originalNumber % 10
        result += Math.pow(remainder.toDouble(), digits.toDouble()).toInt()
        originalNumber /= 10

    if (result == num)
        return true

    return false

When you run the program, the output will be:

1634 8208 9474 54748 92727 93084 

In the above program, we’ve created a function named checkArmstrong() which takes a parameter num and returns a boolean value.

If the number is armstrong, it returns true. If not, it returns false.

Based on the return value, number is printed on the screen inside main() function.


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Disclaimer: The information and code presented within this recipe/tutorial is only for educational and coaching purposes for beginners and developers. Anyone can practice and apply the recipe/tutorial presented here, but the reader is taking full responsibility for his/her actions. The author (content curator) of this recipe (code / program) has made every effort to ensure the accuracy of the information was correct at time of publication. The author (content curator) does not assume and hereby disclaims any liability to any party for any loss, damage, or disruption caused by errors or omissions, whether such errors or omissions result from accident, negligence, or any other cause. The information presented here could also be found in public knowledge domains.  
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