In this program, you'll learn to reverse a number using a while loop and a for loop in Java.

Apr 8, 2025 · Methods to Reverse a Number in Java. We can reverse a number in Java using three main methods as mentioned below: Using While Loop ; Using Recursion; Using StringBuilder class; 1. Using While Loop . Simply apply the steps/algorithm discussed and terminate the loop when the number becomes zero. Example: Java

Sep 15, 2022 · Program 1: Reverse a number using while Loop. In this program, user is asked to enter a number. This input number is read and stored in a variable num using Scanner class. The program then uses the while loop to reverse this number.

Mar 17, 2025 · There are three ways to reverse a number in Java: Reverse a number using while loop; Reverse a number using for loop; Reverse a number using recursion; Let's apply the above steps in an example. Example. Suppose, we want to reverse the number 1234.

Mar 12, 2013 · You will need to use math to access each of the digits. Here's a few hints to get your started: Use the % mod operator to extract the last digit of the number. Use the / division operator to remove the last digit of the number. Stop your loop when you …

Nov 28, 2018 · You could simply convert it to String and using java.lang.StringBuilder reverse the string. int orig = 123456789; String numString = Integer.toString(orig); String reversed = ""; for (int i = numString.length() - 1; i >= 0; i--) { // loop through the string from back to front reversed += numString.charAt(i); // add each character to the ...

Here is a program that reverse a number in Java using the while loop, for loop, and recursive approaches, along with a detailed explanation & examples.

In this tutorial, we will learn how to write a Java program to reverse a number using a while loop and a for loop in Java. We will read input from the console using Scanner class.

In this method, we’ll use a while loop to break down the number input and rearrange the number in reverse order. We’ll use the modulo operator to extract the digits from the number and the divide operator to shorten the number. Let’s implement the above-mentioned logic in Java Language. rem = num % 10; . reverse = reverse * 10 + rem; .

There are multiple approaches to reverse a number in Java: Reverse a number using a while loop; Reverse a number using for loop; Reverse a number using recursion; Example: To reverse the number 1234, we can use the following approach: