# 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
++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
}``````

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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