01-Core-Java/08-Java-Programs/037-Reverse-a-Number.java at main · shaikbasha-dev/01-Core-Java · GitHub

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* ============================================================================

* Program Name : Reverse a Number

* File Name : 037-Reverse-a-Number.java

* Class Name : ReverseANumber

* Description:

* This program accepts an integer from the user and reverses its digits

* using the while loop.

* Objective:

* - Understand user input using the Scanner class.

* - Learn how to use the while loop.

* - Reverse the digits of a given number.

* Author : Shaik Mahaboob Basha

* Repository : 01-Core-Java

* Folder : 08-Java-Programs

* ============================================================================

import java.util.Scanner;

public class ReverseANumber {

// The main() method is the entry point of every Java application.

public static void main(String[] args) {

// Create a Scanner object to read input from the keyboard.

Scanner scanner = new Scanner(System.in);

// Ask the user to enter a number.

System.out.print("Enter a Number: ");

// Read the number entered by the user.

int number = scanner.nextInt();

// Store the original number for displaying the result later.

int originalNumber = number;

// Declare and initialize a variable to store the reversed number.

int reverse = 0;

// Reverse the digits using the while loop.

while (number != 0) {

// Extract the last digit from the number.

int digit = number % 10;

// Append the extracted digit to the reversed number.

reverse = reverse * 10 + digit;

// Remove the last digit from the original number.

number = number / 10;

}

// Display the reversed number.

System.out.println("Reverse of " + originalNumber + " = " + reverse);

// Example Output:

// Enter a Number: 12345

// Reverse of 12345 = 54321

// Close the Scanner object to release system resources.

scanner.close();

}

01-Core-Java/08-Java-Programs/037-Reverse-a-Number.java at main · shaikbasha-dev/01-Core-Java · GitHub

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