armstrong_number.cpp

#include <cmath>

#include <iostream>

using namespace std;

int main() {

   int num, originalNum, remainder, n = 0, result = 0, power;

   cout << "Enter an integer: ";

   cin >> num;

   originalNum = num;

   while (originalNum != 0) {

      originalNum /= 10;

      ++n;

   }

   originalNum = num;

   while (originalNum != 0) {

      remainder = originalNum % 10;

      // pow() returns a double value

      // round() returns the equivalent int

      power = round(pow(remainder, n));

      result += power;

      originalNum /= 10;

   }

   if (result == num)

      cout << num << " is an Armstrong number.";

   else

      cout << num << " is not an Armstrong number.";

   return 0;

}