public static void Main(string[] args)
{
var head1 = new BinaryTreeNode(0);
head1.InsertRight(1).InsertRight(2); // should be 1
var head2 = new BinaryTreeNode(0);
head2.InsertRight(1); // should be 0
var head3 = new BinaryTreeNode(2);
head3.InsertLeft(1); // should be 1
var head4 = new BinaryTreeNode(0); // Error, only 1
var s = "string strin string";
var b = s[0] == s.ToUpper()[0];
Console.WriteLine(b);
// var head5 = null; // error, node is null
Console.WriteLine("Tree 1: " + SecondLargestElement(head1));
Console.WriteLine("Tree 2: " + SecondLargestElement(head2));
Console.WriteLine("Tree 3: " + SecondLargestElement(head3));
try
{
Console.WriteLine("Tree 4: " + SecondLargestElement(head4));
}
catch
{
Console.WriteLine("Tree four throws expected error");
}
}
