static void Main()
{
ExpressionTree exp = new ExpressionTree();
DataService dataService = new DataService();
Node Tree = exp.BuildTree(dataService.Expression); //or exp.BuildTree("your expression"), like exp.BuildTree("(1+2*3)")
WriteLine("Expression is : " + dataService.Expression);
Write("Preorder traversal (KLP) is : ");
exp.PreOrder(Tree);
Write("\nInorder traversal (LKP) is : ");
exp.InOrder(Tree);
Write("\nPostorder traversal (LPK) is : ");
exp.PostOrder(Tree);
WriteLine("\nThe result of the calculation is : " + exp.Calculate(Tree));
WriteLine("Tree height is : " + exp.Height(Tree));
}