# Palindrome program in C# with examples

Palindrome – What’s That?

A palindrome is a sequence of characters that reads the same forward and backwards. In the context of numbers, A palindrome number is the same number when reversed.

• Palindrome number examples: 121, 131, 34543, etc.

In this article, we’ll learn how to write a Palindrome program in C#.

### Method1: Writing Palindrome program in C#:

Now, let’s dive into the C# code to reverse a number and check if it’s a palindrome.

``````using System;

class Program
{
static void Main()
{
// Ask the user to enter a number
Console.WriteLine("Enter a number to check for palindrome: ");

// Store the original number for later comparison
int originalNum = numToCheck;
int reversedNum = 0;

// Reverse the number
while (numToCheck > 0)
{
int remainder = numToCheck % 10;
reversedNum = (reversedNum * 10) + remainder;
numToCheck = numToCheck / 10;
}

// Check if the original and reversed numbers are the same
if (originalNum == reversedNum)
{
Console.WriteLine("The number is a palindrome.");
}
else
{
Console.WriteLine("The number is not a palindrome.");
}
}
}
``````

Output:

``````Enter a number to check for palindrome:
121
The number is a palindrome.``````

Code Explanation:

We have written the above C# program to check if a given number is a palindrome:

• The program first asks the user to input a number.
• The original number is stored for later comparison.
• A while loop is used to reverse the digits of the input number.
• The reversed number is compared with the original number to determine if it’s a palindrome.
• After the comparison, the result is printed to the console.

## Method2: Check palindrome number using string conversion

There are multiple ways to write a C# program to check if a given number is a palindrome. Here is an alternative approach using a string conversion method:

``````using System;

class Program
{
static void Main()
{
// Prompt the user to enter a number
Console.WriteLine("Enter a number to check for palindrome: ");

// Convert the number to a string for easy comparison
string originalString = numToCheck.ToString();
string reversedString = ReverseString(originalString);

// Check if the original and reversed strings are the same
if (originalString.Equals(reversedString))
{
Console.WriteLine("The number is a palindrome.");
}
else
{
Console.WriteLine("The number is not a palindrome.");
}
}

// Function to reverse a string
static string ReverseString(string str)
{
char[] charArray = str.ToCharArray();
Array.Reverse(charArray);
return new string(charArray);
}
}
``````

Output:

``````Enter a number to check for palindrome:
34543
The number is a palindrome.``````

Code Explanation:

• The above program converts the original number to a string using `ToString()`.
• The `ReverseString()` function is used to reverse the string.
• The original and reversed strings are compared using the Equals method to check if it is a palindrome.
• The result is then printed to the console.

Recommended Articles:

5 1 vote
Article Rating
Subscribe
Notify of