private ICalculationExpression ReadNonTerminal(List <string> tokenList)
{
string token = tokenList.First();
tokenList.RemoveAt(0);
ICalculationExpression right = ReadNextToken(tokenList);
ICalculationExpression left = ReadNextToken(tokenList);
if (token == "+")
{
return(new AddExpression(left, right));
}
else if (token == "-")
{
return(new SubtractExpression(left, right));
}
else if (token == "*")
{
return(new MultiplyExpression(left, right));
}
else if (token == "/")
{
return(new DivideExpression(left, right));
}
else if (token == "pow2")
{
return(new PowerOfTwoExpression(right));
}
else if (token == "√")
{
return(new SquareRootExpression(right));
}
else if (token == "1/x")
{
return(new MultiplicativeInverseExpression(right));
}
else if (token == "(" || token == ")")
{
return(right);
}
return(null);
}
public MultiplyExpression(ICalculationExpression left, ICalculationExpression right)
{
this.leftEx = left;
this.rightEx = right;
}
public DivideExpression(ICalculationExpression left, ICalculationExpression right)
{
this.leftEx = left;
this.rightEx = right;
}
public SubtractExpression(ICalculationExpression left, ICalculationExpression right)
{
this.leftEx = left;
this.rightEx = right;
}
public MultiplicativeInverseExpression(ICalculationExpression expr)
{
this.rightEx = expr;
}
public SquareRootExpression(ICalculationExpression expr)
{
this.rightEx = expr;
}
public PowerOfTwoExpression(ICalculationExpression expr)
{
this.rightEx = expr;
}
private double CalculateAnswer()
{
//if (m_PolishStack.Count <= 1) return;
TokenReader PolishTokenReader = new TokenReader();
string m_CombinedInfixString = m_InfixString;
if (m_NumberString != "")
{
m_CombinedInfixString += m_NumberString + ' ';
}
List <string> polishTokenList = m_PolishStack.ToList();
List <string> infixStringArray = m_CombinedInfixString.Split(' ').ToList();
infixStringArray.RemoveAll(IsEmptySpace);
infixStringArray.RemoveAt(infixStringArray.Count - 1);
string rpnString = ConvertInfixToRPN(infixStringArray.ToArray());
List <string> rpnDisplayString = rpnString.Split(' ').ToList();
rpnDisplayString.Reverse();
//rpnDisplayString.RemoveAt(rpnDisplayString.Count - 1);
rpnDisplayString.RemoveAt(0);
debugBox.Text = rpnString;
string stackRpnString = "";
foreach (string token in polishTokenList)
{
stackRpnString += token + " ";
}
//debugBox.Text = stackRpnString + Environment.NewLine + m_sInfixString;
ICalculationExpression resultExpression = null;
try
{
resultExpression = PolishTokenReader.ReadToken(rpnDisplayString);
}
catch (Exception ex)
{
Console.WriteLine("Error: " + ex.Message);
}
ResetInputString();
BuildCalculationString();
double result = 0.0;
if (resultExpression != null)
{
string resultString = "Infinity?";
try {
result = resultExpression.Interpret();
resultString = result.ToString();
}
catch (NullReferenceException exception)
{
Console.WriteLine(exception.Message);
}
calcResultLabel.Text = resultString;
}
else
{
calcResultLabel.Text = "Error";
//ClearCalculations();
Console.WriteLine("Error: resultExpression is a 'null' object");
}
return(result);
}
