How to Reverse Number in C#

Introduction

In this article, we will talk about how to reverse a number in C#. This is an essential technical interview question that may be posed to beginner, intermediate, and experienced candidates.

We previously covered how to reverse a string in the last article,

• How to Reverse String in C#

Reverse Number in C#

Method 1. Let’s create a console application and write the below code in program.cs file.

Console.WriteLine("Enter a Number");
var number = Convert.ToInt32(Console.ReadLine()); 

int reverseNumber = 0;

while(number!=0)
{
    var reminder = number % 10;
    reverseNumber = (reverseNumber * 10) + reminder; 
    number = number / 10;
}

Console.WriteLine($"Reverse Number is: {reverseNumber}");
Console.ReadLine();

Output

Method 2. Let’s try same example with another approach but it is not recommended.

Console.WriteLine("Enter a Number");

var number = Console.ReadLine();
var reverseNumber = new string (number.Reverse().ToArray());

Console.WriteLine($"Reverse Number is: {Convert.ToInt32(reverseNumber)}"); 
Console.ReadLine();

Output

Hope you enjoy this article and learn something new.