👉What is an Armstrong number?

Ok we are getting close to Christmas 🎅 and we have a little more time to do quizzes🧐 I can only recommend you, to read this post to the end as I find it both interesting and eventually we learn something.

Also I don't ask to solve an exercise on the PI but on the #Armstrong number!

An Armstrong number is a number such that the sum of the cubes of its digits is equal to the number itself, or is a number that is equal to the sum of its own digits each raised to the power of the number of digits.

For example,

• 153 is an Armstrong number because 153 = 1^3 + 5^3 + 3^3

• 371 is an Armstrong number because 371 = 3^3 + 7^3 + 1^3

• 407 is an Armstrong number because 407 = 4^3 + 0^3 + 7^3

There are a few reasons why you might want to use an Armstrong number:

1️⃣ They are interesting mathematical curiosities and can be fun to work with.

2️⃣ They can be used to test the accuracy of an implementation of a program that performs arithmetic operations.

3️⃣ They can be used as a simple form of encryption, by encoding a message as an Armstrong number and then sending the number to someone else, who can decode the message by finding the original digits of the number.

However, it's important to note that Armstrong numbers are not commonly used in real-world applications, and there are usually more practical ways to achieve thegoals.

So far i hope everybody understands the process!😉

And as a Christmas gift ☝️, I include to this post an nice basic program in JavaScript👨‍💻 so that the nerds of you can copy the code for example on Visual Studio Code (VSC is for free on Internet) and play the game/quiz with your family!

'use strict';

function checkArmstrongNumber() {

// Prompt the user to enter a number

const num = window.prompt('Enter a number?');

// Convert the number to a string and get the length

const numString = num.toString();

const numLength = numString.length;

// Initialize a sum to keep track of the total

let sum = 0;

// Loop through each digit of the number

for (let i = 0; i < numLength; i++) {

// Get the current digit

const digit = parseInt(numString[i]);

// Add the cube of the digit to the sum

sum += digit ** 3;

}

// Check if the sum is equal to the original number

if (sum === num) {

console.log(`${num} 👉is an Armstrong number 💥🎉`);

} else {

console.log(`${num} is not an Armstrong number 🥺`);

}

}

checkArmstrongNumber();

I hope that some of you will try this code and if you have any comments or questions about the program please fell free to contact me.