public void Clear_ClearTreeFilledWithStudent_ShouldReturnNullRoot()
{
//arrange
Student A = new Student("", "", "", 50);
BSTree <Student> bSTree = new BSTree <Student>(A);
//act
bSTree.Clear();
var res = bSTree.Root;
//assert
Assert.AreEqual(null, res);
}
static public void Main()
{
// build a binary search tree
IBSTree aBSTree = new BSTree();
aBSTree.Insert('M');
aBSTree.Insert('D');
aBSTree.Insert('G');
aBSTree.Insert('A');
aBSTree.Insert('W');
aBSTree.Insert('P');
// pre-order traversal
aBSTree.PreOrderTraverse();
// in-order traversal
aBSTree.InOrderTraverse();
// post-order traversal
aBSTree.PostOrderTraverse();
// delete a leaf A
aBSTree.Delete('A');
// pre-order traversal
aBSTree.PreOrderTraverse();
// in-order traversal
aBSTree.InOrderTraverse();
// post-order traversal
aBSTree.PostOrderTraverse();
// put A back aBStree
aBSTree.Insert('A');
// delete a node W, which has only one child
aBSTree.Delete('W');
// pre-order traversal
aBSTree.PreOrderTraverse();
// in-order traversal
aBSTree.InOrderTraverse();
// post-order traversal
aBSTree.PostOrderTraverse();
// clear the binary tree
aBSTree.Clear();
// pre-order traversal
aBSTree.PreOrderTraverse();
}
static public void Main()
{
// build a binary search tree
Console.WriteLine("Initially, an empty BST is created");
IBSTree aBSTree = new BSTree();
Customer customer01 = new Customer("Huanyi", "Qian", 17701449052);
Customer customer02 = new Customer("Dick", "Pussy", 12345678910);
Customer customer03 = new Customer("Stop", "it", 17701449052);
Customer customer04 = new Customer("Ass", "F**k", 12345678910);
Customer customer05 = new Customer("Idiot", "Freeman", 17701449052);
Customer customer06 = new Customer("Saul", "Goodman", 12345678910);
Customer customer07 = new Customer("Shabi", "ZhuXinhu", 12345678910);
aBSTree.Insert(customer01);
aBSTree.Insert(customer02);
aBSTree.Insert(customer03);
aBSTree.Insert(customer04);
aBSTree.Insert(customer05);
aBSTree.Insert(customer06);
aBSTree.Insert(customer07);
Console.WriteLine();
Console.WriteLine();
// pre-order traversal
aBSTree.PreOrderTraverse();
// in-order traversal
aBSTree.InOrderTraverse();
// post-order traversal
aBSTree.PostOrderTraverse();
Console.WriteLine();
Console.WriteLine();
// delete a leaf A
aBSTree.Delete(customer07);
Console.WriteLine("Zhuxinhu has been deleted from the BST");
Console.WriteLine();
Console.WriteLine();
// pre-order traversal
aBSTree.PreOrderTraverse();
// in-order traversal
aBSTree.InOrderTraverse();
// post-order traversal
aBSTree.PostOrderTraverse();
Console.WriteLine();
Console.WriteLine();
// put A back aBStree
aBSTree.Insert(customer07);
Console.WriteLine("Zhuxinhu has been added back to the BST");
// delete a node W, which has only one child
aBSTree.Delete(customer06);
Console.WriteLine("Goodman has been deleted from the BST");
Console.WriteLine();
Console.WriteLine();
// pre-order traversal
aBSTree.PreOrderTraverse();
// in-order traversal
aBSTree.InOrderTraverse();
// post-order traversal
aBSTree.PostOrderTraverse();
Console.WriteLine();
Console.WriteLine();
// clear the binary tree
aBSTree.Clear();
Console.WriteLine("The BST has been cleard");
Console.WriteLine();
Console.WriteLine();
// pre-order traversal
aBSTree.PreOrderTraverse();
// in-order traversal
aBSTree.InOrderTraverse();
// post-order traversal
aBSTree.PostOrderTraverse();
Console.WriteLine();
Console.WriteLine();
Console.ReadKey();
}