Java Program to Check Armstrong Number

In this tutorial, we will learn how to write a Java program to check Armstrong's number.

Armstrong Number in Java

Armstrong Number in Java: A positive number is called Armstrong number if it is equal to the sum of cubes of its digits for example 0, 1, 153, 370, 371, 407, etc.

Let's try to understand why 153 is an Armstrong number.

153 = (1*1*1)+(5*5*5)+(3*3*3)  
where:  
(1*1*1)=1  
(5*5*5)=125  
(3*3*3)=27  
So:  
1+125+27=153 

Let's try to understand why 371 is an Armstrong number.

371 = (3*3*3)+(7*7*7)+(1*1*1)  
where:  
(3*3*3)=27  
(7*7*7)=343  
(1*1*1)=1  
So:  
27+343+1=371

Java Program to Check Armstrong Number

package com.javaguides.java.tutorial;

import java.util.Scanner;

/**
 * Java Program to Check Armstrong Number
 * 
 * @author https://www.javaguides.net/
 *
 */
public class JavaProgram {
    public static void main(String[] args) {

        try (Scanner scanner = new Scanner(System.in)) {
            int temp, total = 0;
            System.out.println("Ënter 3 Digit Number : ");
            int num = scanner.nextInt();
            int number = num;

            for (; number != 0; number /= 10) {
                temp = number % 10;
                total = total + temp * temp * temp;
            }

            if (total == num) {
                System.out.println(num + " is an Armstrong number");
            } else {
                System.out.println(num + " is not an Armstrong number");
            }
        }
    }
}

Output:

Ënter 3 Digit Number : 
153
153 is an Armstrong number

Related Java Programs

• Java program to calculate the area of Triangle
• Java Program to Calculate Area of Square
• Java Program to Calculate Area of Rectangle
• Java Program to find the Smallest of three numbers using Ternary Operator
• Java Program to Find Largest of Three Numbers
• Java Program to Find GCD of Two Numbers
• Java Program to Check Armstrong Number
• Java Program to Generate Random Number
• Java Program to Check if Number is Positive or Negative
• Java program to check prime number
• Java Program to Calculate Simple Interest
• Java Program to Swap Two Numbers Without using a Temporary Variable
• Java Program to Swap Two Numbers
• Java Program to Find ASCII Value of a Character
• Java Program to Check Whether an Alphabet is Vowel or Consonant
• Java Program to Check Leap Year
• Java Program to Multiply Two Numbers
• Java Program to Check Even or Odd Number
• Java Program to Add Two Numbers
• Java Program to Swap Two Strings Without Using Third Variable
• Java Program to Swap Two Strings with Third Variable
• How to Get All Digits from String in Java
• Find Duplicate Number in Array in Java
• How to Get Current Working Directory in Java?
• Check Palindrome String in Java
• Java Program to Create Pyramid Of Numbers