public void displayMenu()
{
while (true)
{
Console.WriteLine("Menu");
Console.WriteLine("-----------");
Console.WriteLine("1: Enter a new expression");
Console.WriteLine("2: Set a variable value");
Console.WriteLine("3: Evaluate expression");
Console.WriteLine("4: Quit");
Console.WriteLine("-----------");
this.menuSelection = Int32.Parse(Console.ReadLine());
switch (this.menuSelection)
{
case 1: //Enter a new expression
expTree.ClearVariables(); //clear all variables for new expression
this.expression = getExpression(); //gets an expression from the user to be evaluated
expTree = new ExpTree(this.expression); //builds an expression tree with the user entered expression
break;
case 2: //Set a variable value
setVariable();
expTree.SetVar(this.varName, this.varValue); //sets the variable in the dictionary of variables for the tree
break;
case 3: //Evaluate an expression
double result = 0;
result = expTree.Eval(); //returns the evaluated expression result
Console.WriteLine("Evaluated expression is: {0}", result);
break;
case 4:
Environment.Exit(0);
break;
}
}
}