public static double Evaluate(CptS321.ExpTree tree)
{
double evaluate = tree.Eval();
//display the evalate
Console.WriteLine("Evaluate = {0}", evaluate);
return(evaluate);
}
public static CptS321.ExpTree enterExpression()
{
string express = "";
//display and get input
Console.WriteLine("Enter new expression: ");
express = Console.ReadLine();
CptS321.ExpTree tree = new CptS321.ExpTree(express);
return(tree);
}
public static void setVarfromtree(CptS321.ExpTree tree)
{
string name;
double value;
//display and get input
Console.WriteLine("Enter variable name: ");
name = Console.ReadLine();
Console.WriteLine("Enter variable value: ");
double.TryParse(Console.ReadLine(), out value);
Console.WriteLine("successed saved variable Name = {0}, variable Value = {1}", name, value);
tree.setVar(name, value);
}
static void Main(string[] args)
{
string answer = "";
string expression = "";
CptS321.ExpTree tree = null;
while (answer != "4")
{
//clear the console
//Console.Clear();
//display
Menu(expression);
//get input
answer = Console.ReadLine();
if (answer == "1")
{
tree = enterExpression();
expression = tree.setExpression();
}
else if (answer == "2")
{
if (tree != null)
{
setVarfromtree(tree);
}
else
{
Console.WriteLine("Tree is empty\n");
}
}
else if (answer == "3")
{
Evaluate(tree);
}
else if (answer == "4")
{
Console.WriteLine("Done");
}
else
{
Console.WriteLine("Wrong input, ignored. \n");
}
}
}
