Example: C++ Program to Check Armstrong Number using While loop

C
C++
C#
Java
Python
PHP
// C++ Program to Check Armstrong Number using While loop
#include <iostream>
#include <cmath>
using namespace std;

int main() {
    int x, y, z, rem, n = 0;
    float r = 0.0;

    // x - To store the input number
    // y & z - To store the storage of original input number to check
    // rem - To store the reminder
    // r - To store the result variable

    cout << "-----Enter the integer number-----\n";
    cin >> x;

    z = y = x;

    while (y != 0) {
        y /= 10;
        ++n;
    }

    while (z != 0) {
        rem = z % 10;
        r += pow(rem, n);
        z /= 10;
    }

    // if x is equal to r, the number is an Armstrong number
    if ((int) r == x) {
        cout << x << " is an Armstrong number.\n";
    } else {
        cout << x << " is not an Armstrong number.\n";
    }
    return 0;
}