public CalculateTree(String exp)
{
while (true)
{
int pos = lastStepPosition(exp);
if (pos != -1)
{
value = exp[pos].ToString();
String expLeft = exp.Substring(0, pos);
String expRight = exp.Substring(pos + 1, exp.Length - pos - 1);
if (expLeft.Length == 0)
{
leftNode = null;
if ((value == "*") || (value == "/"))
{
throw new Exception("Sign Error");
}
}
else
{
leftNode = new CalculateTree(expLeft);
}
if (expRight.Length == 0)
{
throw new Exception("Sign Error");
}
else
{
rightNode = new CalculateTree(expRight);
}
break;
}
else
{
if ((exp.Length > 0) && (exp[0] == '(') && (exp[exp.Length - 1] == ')'))
{
exp = exp.Remove(exp.Length - 1, 1).Remove(0, 1);
}
else
{
value = exp;
break;
}
}
}
}
private void Button_Click(object sender, EventArgs e)
{
if (update)
{
taskTextBox.Text = "";
resultTextBox.Text = "";
update = false;
}
switch (((Button)sender).Name)
{
case "clearButton":
taskTextBox.Text = "";
resultTextBox.Text = "";
break;
case "deleteButton":
if (taskTextBox.Text.Length > 0)
{
taskTextBox.Text = taskTextBox.Text.Remove(taskTextBox.Text.Length - 1);
}
break;
case "buttonNumber0":
taskTextBox.Text += "0";
break;
case "buttonNumber1":
taskTextBox.Text += "1";
break;
case "buttonNumber2":
taskTextBox.Text += "2";
break;
case "buttonNumber3":
taskTextBox.Text += "3";
break;
case "buttonNumber4":
taskTextBox.Text += "4";
break;
case "buttonNumber5":
taskTextBox.Text += "5";
break;
case "buttonNumber6":
taskTextBox.Text += "6";
break;
case "buttonNumber7":
taskTextBox.Text += "7";
break;
case "buttonNumber8":
taskTextBox.Text += "8";
break;
case "buttonNumber9":
taskTextBox.Text += "9";
break;
case "buttonNumberA":
taskTextBox.Text += "A";
break;
case "leftBracketButton":
taskTextBox.Text += "(";
break;
case "rightBracketButton":
taskTextBox.Text += ")";
break;
case "multiplicationButton":
taskTextBox.Text += "*";
break;
case "divisionButton":
taskTextBox.Text += "/";
break;
case "additionButton":
taskTextBox.Text += "+";
break;
case "subtractionButton":
taskTextBox.Text += "-";
break;
case "dotButton":
taskTextBox.Text += ".";
break;
case "resultButton":
try
{
CalculateTree calc = new CalculateTree(taskTextBox.Text);
calc.calculate();
resultTextBox.Text = calc.getResult();
} catch (Exception exep)
{
resultTextBox.Text = exep.Message;
}
update = true;
break;
}
}