Java: Check whether a number is an Armstrong Number or not

Java Numbers: Exercise-28 with Solution

Write a Java program to check whether a number is an Armstrong Number or not.

Armstrong (Michael F. Armstrong) number is a number that is equal to the sum of cubes of its digits. For example 0, 1, 153, 370, 371 and 407 are the Armstrong numbers

Sample Solution:

Java Code:

import java.util.*;
public class solution {	
 public static boolean is_Amstrong(int n) {
        int remainder, sum = 0, temp = 0;
        temp = n;
        while (n > 0) {
            remainder = n % 10;
            sum = sum + (remainder * remainder * remainder);
            n = n / 10;
        return sum == temp;

   public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Input an integer: ");
		String input = scanner.nextLine();
		int number = Integer.parseInt(input); 
		System.out.println("Is Armstrong number? "+is_Amstrong(number));		

Sample Output:

Input an integer:  153
Is Armstrong number? true


Flowchart: Check whether a number is an Armstrong Number or not

Java Code Editor:

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Java: Tips of the Day


Checks if a value is positive power of two.

To understand how it works let's assume we made a call IsPowerOfTwo(4).

As value is greater than 0, so right side of the && operator will be evaluated.

The result of (~value + 1) is equal to value itself. ~100 + 001 => 011 + 001 => 100. This is equal to value.

The result of (value & value) is value. 100 & 100 => 100.

This will value the expression to true as value is equal to value.

public static boolean isPowerOfTwo(final int value) {
    return value > 0 && ((value & (~value + 1)) == value);

Ref: https://bit.ly/3sA5d4I


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