Algorithm

  1. Input:

    • Take an input number from the user.

  2. Initialization:

    • Initialize variables to store the sum of the cubes of digits and a temporary variable to store the original number.

  3. Extract Digits:

    • Create a loop to extract each digit of the number.
    • Inside the loop, extract the last digit using the modulo operator (%) and update the original number by removing the last digit.

  4. Cube and Sum:

    • Cube each extracted digit and add it to the sum.

  5. Check Armstrong Condition:

    • After processing all digits, compare the sum with the original number.
    • If they are equal, the number is an Armstrong number; otherwise, it is not.

  6. Output:

    • Display the result to the user.

 

Code Examples

#1 Code Example- Check Armstrong Number of Three Digits

Code - Javascript Programming

// program to check an Armstrong number of three digits

let sum = 0;
const number = prompt('Enter a three-digit positive integer: ');

// create a temporary variable
let temp = number;
while (temp > 0) {
    // finding the one's digit
    let remainder = temp % 10;

    sum += remainder * remainder * remainder;

    // removing last digit from the number
    temp = parseInt(temp / 10); // convert float into integer
}
// check the condition
if (sum == number) {
    console.log(`${number} is an Armstrong number`);
}
else {
    console.log(`${number} is not an Armstrong number.`);
}
Copy The Code & Try With Live Editor

Output

x
–
+
cmd
Enter a three-digit positive integer: 153
153 is an Armstrong number.

#2 Code Example- Check Armstrong Number of n Digits

Code - Javascript Programming

// program to check an Armstrong number of n digits

// take an input
const number = prompt("Enter a positive integer");
const numberOfDigits = number.length;
let sum = 0;

// create a temporary variable
let temp = number;

while (temp > 0) {

    let remainder = temp % 10;

    sum += remainder ** numberOfDigits;

    // removing last digit from the number
    temp = parseInt(temp / 10); // convert float into integer
}

if (sum == number) {
    console.log(`${number} is an Armstrong number`);
}
else {
    console.log(`${number} is not an Armstrong number.`);
}
Copy The Code & Try With Live Editor

Output

x
–
+
cmd
Enter a positive integer: 92727
92727 is an Armstrong number
Advertisements

Demonstration

JavaScript Programing Example to Check Armstrong Number-DevsEnv

Previous
JavaScript Practice Example #3 - Assign 3 Variables and Print Good Way