In previous post How to swap or exchange two numbers with or without using any temporary variable in java we learnt how to swap two number with or without using any temporary variable.
In this post we will learn How to reverse a number in Java
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package com.kkjavatutorials.client; import java.util.Scanner; /** * @author KK JavaTutorials * This Java program is all about How to reverse a number without using recursion */ public class ClientTest1 { public static void main(String[] args) { try (Scanner scanner = new Scanner(System.in)) { //Take a number from keyboard using Scanner System.out.println("Enter Number:"); int number = scanner.nextInt(); System.out.println("Original number:"+number); int reversedNumber = reverseNumber(number); System.out.println("Reversed Number:"+reversedNumber); } catch (Exception e) { System.out.println("Please Enter valid number.."); e.printStackTrace(); } } private static int reverseNumber(int number) { //Logic to reverse a number int reversedNumber = 0; int mode = 0; while (number != 0) { mode = number % 10; reversedNumber = (reversedNumber * 10) + mode; number = number / 10; } return reversedNumber; } } |
I have tested above program for few inputs as below. You may check for other input as well
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Enter Number: 8971 Original number:8971 Reversed Number:1798 Enter Number: -186 Original number:-186 Reversed Number:-681 Enter Number: 00188 Original number:188 Reversed Number:881 |
That’s all about this topic How to reverse a number in Java
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