C++ Program to check a number is Armstrong or not of 4 digits

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In this program, you will learn how to check a number is Armstrong or not of 4 digits in C++.

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Some list of Armstrong numbers of 4 digts : 1634, 8208, 9474

Example: How to check a number is Armstrong or not of 4 digits in C++.

#include<iostream>
using namespace std;

int main() {
  int n, num, r, rev = 0;
  cout << "Enter a number:";
  cin >> n;
  num = n;

  while (n > 0) {
    r = n % 10;
    rev = rev + r * r * r * r;
    n = n / 10;
  }

  if (rev == num) {
    cout << "Number is Armstrong:" << num;
  } else {
    cout << "Number is not Armstrong:" << num;
  }
  return 0;

}

Output:

Enter a number:1634
Number is Armstrong:1634