Example: Sum of Digits using While Loop in Java

// Sum of Digits using While Loop
import java.util.Scanner;

// Main class containing the entry point of the program
public class Main {
    public static void main(String[] args) {
        // Step 1: Create a Scanner object to read input
        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: Initialize sum to 0
        int sum = 0;
        int tempNumber = number; // Use a temporary variable to avoid modifying the original number

        // Step 4: Loop until the number becomes 0
        while (tempNumber != 0) {
            // Step 4a: Get the last digit using the modulo operator
            int digit = tempNumber % 10;

            // Step 4b: Add the digit to the sum
            sum += digit;

            // Step 4c: Remove the last digit using integer division
            tempNumber /= 10;
        }

        // Step 5: Print the sum of digits
        System.out.println("Sum of digits for " + number + " is: " + sum);

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