# Kotlin Program to Display Armstrong Numbers Between Intervals Using Function

Kotlin Program to Display Armstrong Numbers Between Intervals Using Function: To find all Armstrong numbers between two integers, check Armstrong() function is created. This function checks whether a number is Armstrong or not.

In the below 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.

## Kotlin Program to Display Armstrong Numbers Between Intervals Using Function

Source Code

``````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
++digits
}

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
}``````

Output