using System;

​

public class Program

{

    public static void Main()

    {

        string originalString = "Hello programmer welcome to the world of programming";

        string replacedString = ReplaceWord(originalString, "programmer", "coder");

        replacedString = ReplaceWord(replacedString, "programming", "coding");

​

        Console.WriteLine(replacedString);

        Console.WriteLine("\nBy Avinash Raghuvanshi\nSection:- A\nRoll No.:- 22");

    }

​

    public static string ReplaceWord(string input, string oldWord, string newWord)

    {

        string[] words = input.Split(' ');

        for (int i = 0; i < words.Length; i++)

        {

            if (words[i].Equals(oldWord))

            {

                words[i] = newWord;

            }

        }

        return string.Join(" ", words);

    }

}

​