Reverse the Substring of a String

Write a program to Reverse a Substring in the given string

using System;

public class ReverseSubString
{
    public static void Main(string[] args)
    {
        var input = "My name is John";
        string[] words = input.Split(' ');
        for(int i = 0; i < words.Length; i++)
        {
            var a = words[i].ToCharArray();
            Array.Reverse(a);
            words[i] = new string(a);
        }
        string result = string.Join(" ", words);
        Console.WriteLine(result);
    }
}

• Split(' ') breaks the string into words.
• ToCharArray() converts each word to a character array.
• Array.Reverse() reverses the characters in place.
• string.Join(" ", words) joins them back with spaces.

Now lets see the concise LINQ version of the same solution:

using System;
using System.Linq;

class Program
{
    static void Main()
    {
        string input = "My name is John";
        string result = string.Join(" ",
            input.Split(' ')
                 .Select(word => new string(word.Reverse().ToArray())));

        Console.WriteLine(result);
    }
}

Output:

yM eman si nhoJ

• input.Split(' ') → splits the string into words.
• .Select(word => new string(word.Reverse().ToArray())) → reverses each word.
• string.Join(" ", ...) → joins the reversed words back into a single string.