Example: Sum of Digits using Modulo and Division in Java

// Sum of Digits using Modulo and Division
import java.util.Scanner;

// Main class containing the entry point of the program
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        // Step 1: Get input number from the user
        System.out.print("Enter a non-negative integer: ");
        int number = scanner.nextInt();

        // Step 2: Initialize sum
        int sum = 0;

        // Step 3: Loop until the number becomes 0
        int tempNumber = number; // Use a temporary variable to preserve original number
        while (tempNumber != 0) {
            // Get the last digit
            int digit = tempNumber % 10;
            // Add the digit to sum
            sum += digit;
            // Remove the last digit
            tempNumber /= 10;
        }

        // Step 4: Print the result
        System.out.println("The sum of digits of " + number + " is: " + sum);

        scanner.close();
    }
}