Armstrong Number in C++

  • November 23, 2022
  • C++
palindrome string

What is Armstrong Number?

The Armstrong number is a number that is equal to the sum of its digits’ cubes. Armstrong numbers include 0, 1, 153, 370, 371, and 407.

Let’s look at why 371 is amrstrong in nature:

371 = (3*3*3)+(7*7*7)+(1*1*1)    

Approach: The approach is to first count the number of digits (or find the order). Let n be the number of digits. Calculate r^n for each digit r in the input number x. If the sum of all such values equals the number, return true; otherwise, return false.

Program code:

#include <iostream>
using namespace std;

int main() {
		int n ;
		int temp = n;
		int p = 0;

		/*function to calculate
		the sum of individual digits
		while (n > 0) {

			int rem = n % 10;
			p = (p) + (rem * rem * rem);
			n = n / 10;

		/* condition to check whether
		the value of P equals
		to user input or not. */
		if (temp == p) {
			cout<<temp<<"  is an Armstrong No.";
		else {
			cout<<temp<<" is not an Armstrong No.";
	return 0;


321 is not an Armstrong No.

153 is an Armstrong No.

Note: also read about Factorial of a given Number

Follow Me

Please follow me to read my latest post on programming and technology if you like my post.

Leave a Reply

Your email address will not be published. Required fields are marked *