Write A C# Program To Reverse A String

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write a c# program to reverse a string

Do you want to know how to write a C# program to reverse a string? In this C# tutorial, I will explain how to reverse a string in C#.

To reverse a string in C#, you can use a straightforward method involving a for loop or the built-in Array.Reverse method. For example, if you have a string “Hello”, you can convert it to a char array, apply Array.Reverse, and then reconvert it to a string, resulting in the reversed string “olleH”. This approach is efficient and easy to implement in any C# program.

Write A C# Program To Reverse A String

Reversing a string in C# means arranging its characters in the opposite order. For example, if our input is “Hello”, the reversed string will be “olleH”.

C# offers multiple ways to reverse a string. I’ll guide you through a simple and effective method using a for loop.

Here is a complete program to reverse a string in C#.

using System;

namespace StringReversal
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Enter a string to reverse:");
            string originalString = Console.ReadLine();

            string reversedString = ReverseString(originalString);

            Console.WriteLine($"Reversed String: {reversedString}");
        }

        static string ReverseString(string s)
        {
            char[] charArray = s.ToCharArray();
            Array.Reverse(charArray);
            return new string(charArray);
        }
    }
}
  • string originalString = Console.ReadLine();: This line takes the user’s input.
  • string reversedString = ReverseString(originalString);: Here, we’re calling the ReverseString method and passing the user’s input to it.
  • ReverseString Method: This method converts the string into a character array, reverses it, and then converts it back to a string.

After writing the C# code and when I run the program using the Visual Studio console application, it will prompt me to enter a string. Once entered, the program will display the reversed string by using the above C# code.

Here is the screenshot below:

write a c# program to reverse a string

There are also other methods to reverse a string in C#. Here are a few:

Reverse a string in C# using StringBuilder

Here is a complete program to reverse a string in C# using StringBuilder.

using System;
using System.Text;

class Program
{
    static void Main()
    {
        string original = "Example";
        string reversed = ReverseStringWithStringBuilder(original);
        Console.WriteLine(reversed); // Output: "elpmaxE"
    }

    static string ReverseStringWithStringBuilder(string str)
    {
        StringBuilder sb = new StringBuilder();
        for (int i = str.Length - 1; i >= 0; i--)
        {
            sb.Append(str[i]);
        }
        return sb.ToString();
    }
}

Write a C# program to reverse a string using LINQ

You can also use LINQ in C# to reverse a string. Here is a complete program to reverse a string using LINQ in C#.

using System;
using System.Linq;

class Program
{
    static void Main()
    {
        string original = "Reverse";
        string reversed = new string(original.Reverse().ToArray());
        Console.WriteLine(reversed); // Output: "esreveR"
    }
}

Reverse a C# string using Array.Reverse() with Char Array

Now, I will show you another way to reverse a string using Array.Reverse() with Char Array in C#. Here is a complete program.

using System;

class Program
{
    static void Main()
    {
        string original = "ArrayReverse";
        string reversed = ReverseWithArrayReverse(original);
        Console.WriteLine(reversed); // Output: "esreveRyarrA"
    }

    static string ReverseWithArrayReverse(string str)
    {
        char[] charArray = str.ToCharArray();
        Array.Reverse(charArray);
        return new string(charArray);
    }
}

The Array.Reverse() method where we manually convert the string to a char array and back in C#.

Conclusion

In this tutorial, I have explained how to write a C# program to reverse a string. I have shown you by executing a complete example. I have also explained a few other methods to reverse a string in C# like by using the StringBuilder, LINQ, and using Array.Reverse() with Char Array.

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