static void Main(string[] args)
{
ExpTree tree = new ExpTree("A+B+3-(E3-54)"); //default starting value of our Expression tree.
int number = 0;
tree.SetVar("A", 2); //setting some example values to the variables
tree.SetVar("B", 5);
do
{
Console.WriteLine("Menu: (current expression: {0})", tree.ToString()); //menu
Console.WriteLine("\t1 = Enter a new expression");
Console.WriteLine("\t2 = Set a variable value");
Console.WriteLine("\t3 = Evaluate tree");
Console.WriteLine("\t4 = Quit");
bool isInt = int.TryParse(Console.ReadLine(), out number); //gets user input and stres it in number if it is an integer.
if (isInt)
{
switch (number)
{
case 1:
Console.Write("Enter new expression: ");
string userInput = Console.ReadLine();
tree = new ExpTree(userInput); //makes a new tree with the new expression
break;
case 2:
Console.Write("Enter variable name: ");
string userInputVariable = Console.ReadLine();
Console.Write("Enter variable value: ");
string userInputValue = Console.ReadLine();
bool isDouble = double.TryParse(userInputValue, out double parsedDouble); //stores the user input as a double if it is a double
if (isDouble) //if the value inputted was a double
{
tree.SetVar(userInputVariable, parsedDouble); //set the variable to that double
}
break;
case 3:
Console.WriteLine(tree.Eval());
break;
}
}
} while (number != 4); //runs until 4 is typed in and then falls out to main.
}
