C# Program to Find the Longest Word in a String

In this article, we’ll learn how to write a C# program to find the longest word in a string. We’ll break down the problem, provide multiple code examples, and explain each step.

Program to Find the Longest Word in a String

Problem Statement

We want to find the longest word within an input string. 

Word: A word is defined as a sequence of characters separated by spaces.

Approach

We’ll follow these steps to solve the problem:

  1. Split the String: We’ll split the input string into individual words based on spaces.
  2. Track the Longest Word: We’ll keep track of the longest word encountered so far.
  3. Iterate Through Words: We’ll loop through each word in the array of words.
  4. Compare Lengths: For each word, we’ll compare its length with the longest word found so far. If the current word is longer, we’ll update our longest word.
  5. Display the Result: Finally, we’ll display the longest word.

Code Example 1: Find the Longest Word in a String Using Split and Loop

using System;

public class FindLongestWord
{
    public static void Main()
    {
     string input = "Sample string with multiple words";

        // Split the string into words based on spaces
        string[] words = input.Split(' ');

        string longestWord = string.Empty; // Initialize an empty string to store the longest word

        foreach (string word in words)
        {
            if (word.Length > longestWord.Length)
            {
                longestWord = word; // Update the longest word
            }
        }

        Console.WriteLine($"The longest word is: {longestWord}");
    }
}

Output:

The longest word is: multiple

Code Example 2: Find the Longest Word in a String Using LINQ

using System;
using System.Linq;

public class FindLongestWord
{
    public static void Main()
    {
        string input = "Sample string with multiple words";

        // Split the string into words based on spaces
        string[] words = input.Split();

        // Find the longest word using LINQ
        string longestWord = words.OrderByDescending(w => w.Length).FirstOrDefault();

        Console.WriteLine($"The longest word is: {longestWord}");
    }
}

Output:

The longest word is: multiple

Code Explanation

  • In both examples, we split the input string into an array of words using Split.
  • We then iterate through the words, comparing their lengths to find the longest word.
  • Example 1 uses a loop, while Example 2 leverages LINQ for a more straightforward solution.

Remember, understanding the problem and breaking it down step by step is crucial in software development. Happy coding!

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Shekh Ali
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