#include <math.h>
#include <stdio.h>

int armstrongNumberInterval() {
  int low, high, number, originalNumber, rem, count = 0;
  double result = 0.0;
  printf("Enter two numbers(intervals): ");
  scanf("%d %d", &low, &high);
  printf("Armstrong numbers between %d and %d are: ", low, high);
  // swap numbers if high < low
  if (high < low) {
    high += low;
    low = high - low;
    high -= low;
  }
  // iterate number from (low + 1) to (high - 1)
  // In each iteration, check if number is Armstrong
  for (number = low + 1; number < high; ++number) {
    originalNumber = number;
    // number of digits calculation
    while (originalNumber != 0) {
      originalNumber /= 10;
      ++count;
    }
    originalNumber = number;
    // result contains sum of nth power of individual digits
    while (originalNumber != 0) {
      rem = originalNumber % 10;
      result += pow(rem, count);
      originalNumber /= 10;
    }
    // check if number is equal to the sum of nth power of individual digits
    if ((int)result == number) {
      printf("%d ", number);
    }
    // resetting the values
    count = 0;
    result = 0;
  }
  return 0;
}