// Naomi Jones
// Survey, Summer 2025
// July 6, 2025
// Assignment 6 - 2 C# Dictionary
 
using System;
using System.Collections.Generic;
 
namespace DictionaryOpera
{
    class Program
    {
        static void Main(string[] args)
        {
            // Creates a dictionary in which both keys and values are strings.
            Dictionary<string, string> dict = new Dictionary<string, string>();
 
            // Add items to the dictionary. Each has a key and a value.
            dict.Add("Don Giovanni", "Serial seducer ends up in hell.");
            dict.Add("Un Ballo in Maschera", "Everyone ends up at a masked ball where someone gets stabbed.");
            dict.Add("Aida", "Unhappy love triangle.");
            dict.Add("Der fliegende Holländer", "A ghostly captain gets a shot at redemption every seven years.");
            dict.Add("Fidelio", "Cosplay jail break.");
            dict.Add("Turandot", "Princess gives death-or-marriage riddles, a bold prince takes a chance, and everyone stays up all night trying to figure out who he is.");
 
            // Decided to remove Fidelio and add Gotterdammerung.
            dict.Remove("Fidelio");
            dict.Add("Gotterdammerung", "The last chapter of 15 hours of opera.");
 
            // Displays the contents of the dictionary.
            Console.WriteLine("A list of favorite operas: ");
            foreach (KeyValuePair<string, string> pair in dict)
            {
                // String methods to format the output since both are strings.
                Console.WriteLine("Key: " + pair.Key.PadRight(25) + " Value: " + pair.Value);
            }
 
            // Method to check if particular keys are contained in the dictionary.
		    Console.WriteLine ("\nUsing the ContainsKey method to see if an opera exists in the dictionary:");
            Console.WriteLine ("Contains key Carmen       " + dict.ContainsKey ("Carmen"));
            Console.WriteLine ("Contains key La Boheme     " + dict.ContainsKey ("La Boheme"));
            Console.WriteLine ("Contains key Don Giovanni " + dict.ContainsKey ("Don Giovanni"));
 
            // Retrieving just the keys.
            Console.WriteLine ("\nPrinting just the keys:");
            Dictionary<string, string>.KeyCollection keys = dict.Keys;
            foreach(string key in keys)
            {
                Console.WriteLine ("Key: " + key);
            }
 
        } // main
 
    } // Program class
 
} // DictionaryOpera namespace
 

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