Hast Table - Dictionary C# Exercise - C# Programming Course

// Importing necessary namespaces for handling collections
using System;  // Basic namespace for console input/output and other fundamental operations
using System.Collections;  // To use Hashtable, a collection type for key-value pairs

class Program
{
    // Creating a Hashtable to store key-value pairs
    static Hashtable dictionary = new Hashtable();  // Hashtable for storing dictionary entries with keys and values

    // Method to add a word and its meaning to the dictionary
    static void AddWord(string word, string meaning)
    {
        // Check if the word already exists in the dictionary
        if (!dictionary.ContainsKey(word))  // If the word is not already in the dictionary
        {
            dictionary.Add(word, meaning);  // Add the word and its meaning to the dictionary
            Console.WriteLine($"Added '{word}' to the dictionary.");  // Inform the user that the word was added
        }
        else
        {
            Console.WriteLine($"'{word}' already exists in the dictionary.");  // If the word is already present, inform the user
        }
    }

    // Method to search for a word in the dictionary
    static void SearchWord(string word)
    {
        // Check if the word exists in the dictionary
        if (dictionary.ContainsKey(word))  // If the word is found in the dictionary
        {
            // Retrieve and display the meaning of the word
            Console.WriteLine($"{word}: {dictionary[word]}");  // Display the meaning of the word
        }
        else
        {
            Console.WriteLine($"'{word}' not found in the dictionary.");  // If the word doesn't exist, inform the user
        }
    }

    // Main program method to interact with the user and manage the dictionary
    static void Main(string[] args)
    {
        // Add some words to the dictionary
        AddWord("Apple", "A round fruit with red or green skin and a whitish interior.");
        AddWord("Banana", "A long, curved fruit with a yellow skin.");
        AddWord("Computer", "An electronic device for storing and processing data.");

        // Ask the user to input a word to search
        Console.Write("Enter a word to search in the dictionary: ");
        string wordToSearch = Console.ReadLine();  // Read the user's input for the word to search

        // Search and display the meaning of the entered word
        SearchWord(wordToSearch);  // Call the SearchWord method to find and display the meaning

        // Optionally, display the entire dictionary (all words and their meanings)
        Console.WriteLine("\nFull Dictionary:");
        foreach (DictionaryEntry entry in dictionary)  // Iterate over all entries in the dictionary
        {
            Console.WriteLine($"{entry.Key}: {entry.Value}");  // Display each word and its meaning
        }
    }
}