Question

How to replace a random word in a string with a random word from a list of words using C#

Answer 1

using System;
using System.Collections.Generic;

class Program
{
    static string ReplaceRandomWord(string text, List<string> replacements)
    {
        var words = new List<string>(text.Split(' '));

        if (words.Count == 0 || replacements.Count == 0)
            return text; // nothing to do

        var rnd = new Random();

        // Pick random index in the sentence
        int idx = rnd.Next(words.Count);

        // Pick random replacement word
        string newWord = replacements[rnd.Next(replacements.Count)];

        // Replace it
        words[idx] = newWord;

        // Rebuild the string
        return string.Join(" ", words);
    }

    static void Main()
    {
        string text = "The quick brown fox jumps over the lazy dog";
        var replacementWords = new List<string> { "c#", "c++", "java", "rust", "python" };

        string result = ReplaceRandomWord(text, replacementWords);
        Console.WriteLine(result);
    }
}



/*
run:

java quick brown fox jumps over the lazy dog

*/

 

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