/// <summary>
/// Invoked when a key is pressed, checked the key types and do the required operation as per the condition or case.
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
public string SendKeyPress(char key)
{
// Add your implementation here.
if (IsListOfKeys(key))
{
if (CalculatorUtility.IsNumber(key))
{
if (calStr.ToString() == "0" && key == '0')
{
return(calStr.ToString());
}
else if (calStr.ToString() == "0" && key != '0')
{
calStr.Clear();
}
//return calStr.Append(key.ToString()).ToString();
calStr.Append(key.ToString()).ToString();
double.TryParse(calStr.ToString(), out double TotalNum);
entity.lastCalcNumber = TotalNum;
return(calStr.ToString());
}
else if (CalculatorUtility.IsDecimalPoint(key))
{
if (calStr.Length > 0 && !calStr.ToString().Contains("."))
{
return(calStr.Append(key.ToString()).ToString());
}
else
{
return(calStr.ToString());
}
}
else if (CalculatorUtility.IsOperator(key))
{
CallConditionalCalc(key);
}
else if (IsReset(key))
{
return(Reset());
}
else if (IsSign(key) && calStr.Length > 0)
{
return(ChangeSign());
}
return(entity.errorChar ?? entity.result.ToString());
}
return(calStr.ToString());
//throw new NotImplementedException();
}
public string SendKeyPress(char key)
{
if (calculatorUtility.IsResetKey(key))
{
calculatorUtility = new CalculatorUtility();
return("0");
}
else if (calculatorUtility.isKeyZero(key))
{
if (!calculatorUtility.Number.Equals("0"))
{
calculatorUtility.Number += key;
}
return(calculatorUtility.Number);
}
else if (calculatorUtility.IsNumber(key))
{
calculatorUtility.Number += key;
return(calculatorUtility.Number);
}
else if (calculatorUtility.IsNegativeNumber(key))
{
int temp;
if (int.TryParse(calculatorUtility.Number, out temp))
{
calculatorUtility.Number = (-temp).ToString();
}
else
{
calculatorUtility.Number = (-float.Parse(calculatorUtility.Number)).ToString();
}
return(calculatorUtility.Number);
}
else if (calculatorUtility.IsDecimalPoint(key))
{
int temp;
if (int.TryParse(calculatorUtility.Number, out temp))
{
calculatorUtility.Number += key;
}
return(calculatorUtility.Number);
}
else if (calculatorUtility.IsArithmeticOperator(key))
{
if (calculatorUtility.Flag == 0 && calculatorUtility.PreviousOperator != '?')
{
if (!SetFlagAndPreviousOperator(key))
{
return("-E-");
}
}
else
{
if (calculatorUtility.calculateResult(key) == "-E-")
{
return("-E-");
}
}
return(calculatorUtility.Result.ToString());
}
else if (calculatorUtility.IsEqualOperator(key))
{
if (calculatorUtility.Number == "")
{
calculatorUtility.Number = calculatorUtility.Result.ToString();
}
return(SendKeyPress(calculatorUtility.PreviousOperator));
}
else
{
return(calculatorUtility.Number);
}
//throw new NotImplementedException();
}