// Naomi Jones
// Survey, Summer 2025
// July 6, 2025
// Assignment 6 - 6 C# Hashset
 
using System;
using System.Collections.Generic;
 
class OperaList
{
    static void Main()
    {
        HashSet<String> Italian = new HashSet<String>();
        HashSet<String> German = new HashSet<String>();
 
        Italian.Add ("Don Giovanni");
        Italian.Add ("Un ballo in maschera");
        Italian.Add ("Aida");
        Italian.Add ("Turandot");
        Italian.Add ("Gotterdammerung");
        Italian.Remove ("Gotterdammerung"); // Delete - not Italian
 
        German.Add ("Der fliegende Hollander");
        German.Add ("Gotterdammerung");
 
        // Displays Italian operas.
        Console.Write ("Italian operas contain(s) {0} elements: ", Italian.Count);
        DisplaySet (Italian);
 
        // Displays German operas.
        Console.Write("German operas contain(s) {0} elements: ", German.Count);
        DisplaySet (German);
 
        // HashSet with both Italian and German operas.
        HashSet<String> allClassMembers = new HashSet<String>(Italian);
        Console.WriteLine ("\nItalian and German operas on my list...");
        allClassMembers.UnionWith (German);
 
        Console.Write ("contains {0} elements: ", allClassMembers.Count);
        DisplaySet (allClassMembers);
 
    }
 
    private static void DisplaySet (HashSet<String> set)
    {
        Console.Write ("{");
        foreach (String i in set)
        {
                Console.Write (" {0}", i);
        }
        Console.WriteLine (" }");
    }
 
} // HashSet
 
 

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