using System;
using Ilog.Language.Util;

public class HashSetTest
{
  public static void  Main ()
    {
      HashSet A = new HashSet();

      A.Add("a"); A.Add("b"); A.Add("c"); A.Add("d");
      A.Add("a"); A.Add("b"); A.Add("c"); A.Add("d");	// same on purpose
      A.Add("e"); A.Add("f"); A.Add("g"); A.Add("h");
      A.Add("i"); A.Add("j"); A.Add("k"); A.Add("l");

      Console.WriteLine("There are {0} elements in set A:",A.Count);
      Console.WriteLine("A = {0}",A);

      if (A["a"])
	Console.WriteLine("a belongs to A");

      if (!A["x"])
	Console.WriteLine("x does not belong to A");

      A["x"] = true;

      Console.WriteLine("A = {0}",A);

      A["x"] = false;

      Console.WriteLine("A = {0}",A);

      A.Remove("e"); A.Remove("f"); A.Remove("g"); A.Remove("h");
      A.Remove("e"); A.Remove("f"); A.Remove("g"); A.Remove("h"); // same on purpose

      Console.WriteLine("There are {0} elements in set A:",A.Count);
      Console.WriteLine("A = {0}",A);

      HashSet B = new HashSet();

      B.Add("a"); B.Add("b"); B.Add("c"); B.Add("d");

      Console.WriteLine("There are {0} elements in set B:",B.Count);
      Console.WriteLine("B = {0}",B);

      if (A.Equals(B))
	Console.WriteLine("A and B are equal sets");
      else
	Console.WriteLine("A and B are NOT equal sets");

      if (A <= B)
	Console.WriteLine("Set A is a subset of set B");
      else
	Console.WriteLine("Set A is NOT a subset of set B");

      if (A < B)
	Console.WriteLine("Set A is a STRICT subset of set B");
      else
	Console.WriteLine("Set A is NOT a STRICT subset of set B");

      if (B <= A)
	Console.WriteLine("Set B is a subset of set A");
      else
	Console.WriteLine("Set B is NOT a subset of set A");

      if (B < A)
	Console.WriteLine("Set B is a STRICT subset of set A");
      else
	Console.WriteLine("Set B is NOT a STRICT subset of set A");

      A.Remove("i"); A.Remove("k"); A.Remove("j"); A.Remove("l");

      Console.WriteLine("There are {0} elements in set A:",A.Count);
      Console.WriteLine("A = {0}",A);

      if (A.Equals(B))
	Console.WriteLine("A and B are equal sets");
      else
	Console.WriteLine("A and B are NOT equal sets");

      A.Clear();

      Console.WriteLine("There are {0} elements in set A:",A.Count);
      Console.WriteLine(A);

      B.Clear();

      A.Add(1); A.Add(2); A.Add(3); A.Add(4); A.Add(5); A.Add(6); 
      B.Add(1); B.Add(7); B.Add(3); B.Add(8); B.Add(5); B.Add(9);

      Console.WriteLine("A = {0}",A);
      Console.WriteLine("B = {0}",B);
      Console.WriteLine("A+B = {0}",A+B);
      Console.WriteLine("A&B = {0}",A&B);
      Console.WriteLine("A-B = {0}",A-B);
      Console.WriteLine("A^B = {0}",A^B);
      Console.WriteLine("A = {0}",A);
      Console.WriteLine("B = {0}",B);

      A += B;
      Console.WriteLine("After A += B, A = {0}",A);
      A &= B;
      Console.WriteLine("After A &= B, A = {0}",A);

      A.Clear();
      B.Clear();
      A.Add(1); A.Add(2); A.Add(3); A.Add(4); A.Add(5); A.Add(6); 
      B.Add(1); B.Add(7); B.Add(3); B.Add(8); B.Add(5); B.Add(9);

      Console.WriteLine("A = {0}",A);
      Console.WriteLine("B = {0}",B);
      A.Union(B);
      Console.WriteLine("After A.Union(B), A = {0}",A);
      A.Intersection(B);
      Console.WriteLine("After A.Intersection(B), A = {0}",A);

    }
}