Example: Reverse a Number using For Loop in Java

// Reverse a Number using For 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: Initialize Scanner for user input
        Scanner scanner = new Scanner(System.in);

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

        // Step 3: Initialize variable to store the reversed number
        int reversedNumber = 0;

        // Step 4: Use a for loop to reverse the number
        // The loop continues as long as originalNumber is not 0
        // In each iteration, originalNumber is divided by 10 to remove the last digit
        for (int tempNumber = originalNumber; tempNumber != 0; tempNumber /= 10) {
            // Get the last digit of the current number
            int digit = tempNumber % 10;

            // Append the digit to the reversedNumber
            // Multiply reversedNumber by 10 to shift existing digits to the left
            // Then add the new digit
            reversedNumber = reversedNumber * 10 + digit;
        }

        // Step 5: Print the original and reversed numbers
        System.out.println("Original Number: " + originalNumber);
        System.out.println("Reversed Number: " + reversedNumber);

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