In this article we are going to discuss a problem from arrays; this is one of the most commonly asked interview question of today.

Reverse a number without changing it to string and without using reverse().

e.g. if given number is 12345 than we have to reverse it to 54321.

Here is a straight forward solution for the problem, We can reverse the number using some mathematical calculations as shown in example below:

package com.tbNext.byexample;

public class TBReverseANumber {

	public static void main(String[] args) {
		int input = 8787956;
		System.out.println("Reversed Number");
		while (input > 0) {
			int rem = input % 10;
			input = (input - rem) / 10;




Reversed Number

That's it, we have seen how to reverse a number without converting it to a string or without using reverse(). In upcoming articles of Java Algorithms and interview series we will see more about Java and Related programming problems and solutions.
  • By
  • May 9, 2015
  • Programming