🚀 Programming Example

Java program to check armstrong number

👁 1,783 Views

💻 Practical Program

📘 Step Learning

In this section you will learn about the java program to check whether a number is Armstrong number or not?

📌 Information & Algorithm

Write a program to find out the Armstrong number using user input.: This java program checks if a number is Armstrong or not. Armstrong number is a number which is equal to sum of digits raise.

Know More about Armstrong Number from this link.

💻 Program Code

import java.util.Scanner;
 
class ArmstrongNumber
{
   public static void main(String args[])
   {
      int n, sum = 0, temp, remainder, digits = 0;
 
      Scanner in = new Scanner(System.in);
      System.out.println("Input a number to check if it is an Armstrong number");      
      n = in.nextInt();
 
      temp = n;
 
      // Count number of digits
 
      while (temp != 0) {
         digits++;
         temp = temp/10;
      }
 
      temp = n;
 
      while (temp != 0) {
         remainder = temp%10;
         sum = sum + power(remainder, digits);
         temp = temp/10;
      }
 
      if (n == sum)
         System.out.println(n + " is an Armstrong number.");
      else
         System.out.println(n + " is not an Armstrong number.");         
   }
 
   static int power(int n, int r) {
      int c, p = 1;
 
      for (c = 1; c <= r; c++) 
         p = p*n;
 
      return p;   
   }
}

🖥 Program Output

<b>Output 1:</b>
Input a number to check if it is an Armstrong number
45781
45781 is not an Armstrong number.
<b>Output 2:</b>
 Input a number to check if it is an Armstrong number
9926315
9926315 is an Armstrong number.

📘 Explanation

None

🎯 How to learn from this example

First understand the algorithm carefully. Then study the program line-by-line and compare it with the output. Finally, review the explanation section to strengthen your logic and programming understanding.

🔥 Practice suggestion

Rewrite the program without looking at the code. Modify values, conditions or logic and run it again. This helps improve confidence and strengthens coding skills much faster.

⚡ Quick Practice Flow

Follow this learning sequence for better understanding.

Read the topic carefully
Understand the algorithm
Study the code line-by-line
Check the output result
Practice by modifying logic