Example: Reverse Number using While Loop in Java

// Reverse Number 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) {
        Scanner scanner = new Scanner(System.in);

        // Step 1: Get input from the user
        System.out.print("Enter a number to reverse: ");
        int originalNumber = scanner.nextInt();
        int number = originalNumber;
        int reversedNumber = 0;

        // Step 2: Use a while loop to extract and reverse digits
        while (number != 0) {
            int digit = number % 10; // Extract the last digit
            reversedNumber = reversedNumber * 10 + digit; // Append the digit to reversedNumber
            number /= 10; // Remove the last digit from the number
        }

        // Step 3: Print the reversed number
        System.out.println("Original number: " + originalNumber);
        System.out.println("Reversed number: " + reversedNumber);

        scanner.close();
    }
}