// Explained in Stack class
public override double?GetValue(int stackLength = -1)
{
// if no count given, set length as count
if (stackLength == -1)
{
stackLength = getLength();
}
if (stackLength == 0)
{
return(null);
}
else if (stackLength == 1)
{
return(item);
}
else
{
return(next.GetValue(stackLength - 1));
}
}
/// <summary>
/// Calculates last 2 values from stack and adds result to stack
/// </summary>
/// <param name="value"></param>
public void Operator(string value)
{
int listBoxCount = listBoxValues.Count;
if (listBoxCount >= 2)
{
// doubles used in calculation
double?a, b;
switch (array)
{
case "ArrayStack":
b = arrayStack.GetValue();
arrayStack.Remove();
a = arrayStack.GetValue();
arrayStack.Remove();
break;
case "ListStack":
b = listStack.GetValue();
listStack.Remove();
a = listStack.GetValue();
listStack.Remove();
break;
case "MyListStack":
b = myListStack.GetValue();
System.Windows.Forms.MessageBox.Show("b - " + b.ToString());
a = myListStack.GetValue();
System.Windows.Forms.MessageBox.Show("a - " + a.ToString());
myListStack.Remove();
myListStack.Remove();
break;
default:
a = 1;
b = 1;
break;
}
switch (value)
{
case "/":
lastResult = a / b;
break;
case "*":
lastResult = a * b;
break;
case "-":
lastResult = a - b;
break;
case "+":
lastResult = a + b;
break;
default:
lastResult = 0;
break;
}
// Remove last to values from list
listBoxValues.RemoveAt(listBoxCount - 1);
listBoxValues.RemoveAt(listBoxCount - 2);
AddToStack(true);
}
}