Example: Strong Number Checker in Java

// Strong Number Checker
import java.util.Scanner;

// Main class containing the entry point of the program
public class Main {

    // Method to calculate the factorial of a number
    public static long factorial(int n) {
        if (n == 0 || n == 1) {
            return 1;
        }
        long fact = 1;
        for (int i = 2; i <= n; i++) {
            fact *= i;
        }
        return fact;
    }

    public static void main(String[] args) {
        // Step 1: Create a Scanner object to read input from the user
        Scanner scanner = new Scanner(System.in);

        // Step 2: Prompt the user to enter a number
        System.out.print("Enter a number: ");
        int number = scanner.nextInt();

        // Step 3: Store the original number for comparison later
        int originalNumber = number;
        long sumOfFactorials = 0;

        // Step 4: Iterate through each digit of the number
        while (number > 0) {
            int digit = number % 10; // Get the last digit
            sumOfFactorials += factorial(digit); // Add factorial of the digit to the sum
            number /= 10; // Remove the last digit
        }

        // Step 5: Compare the sum of factorials with the original number
        if (sumOfFactorials == originalNumber) {
            System.out.println(originalNumber + " is a strong number.");
        } else {
            System.out.println(originalNumber + " is not a strong number.");
        }

        // Step 6: Close the scanner
        scanner.close();
    }
}