Reverse number in java

In this post, we will see how to reverse a number in java.

Here is simple program to reverse a number.

package org.arpit.java2blog;

import java.util.Scanner;

public class ReverseNumberMain {

    public static void main(String[] args) {
        int number, reversedNumber=0, remainder;
        Scanner scan = new Scanner(System.in);

        System.out.print("Enter a Number : ");
        number = scan.nextInt();

        while(number != 0)
        {
            remainder = number%10;
            reversedNumber = reversedNumber*10 + remainder;
            number = number/10;
        }

        System.out.print("Reverse of the number : " +reversedNumber);
        scan.close();
    }

}

Output:

Let’s just observe values of variables at the end of each iteration.
Iteration 0: number = 4567,remainder = 0, reversedNumber = 0
Iteration 1: number = 456,remainder = 7, reversedNumber = 7
Iteration 2: number = 45,remainder = 6, reversedNumber = 76
Iteration 3: number = 4,remainder = 5, reversedNumber = 765
Iteration 4: number = 0,remainder = 4, reversedNumber = 7654

That’s all about reversing a number in java.