private void PerformSingleOperation(SingleCalcOperation currentSingleCalcOperation)
{
wasSolvedBefore = true;
if (!wasLastOperationInvalid)
{
double answer = OperateOneNumber(currentSingleCalcOperation);
string answerString = ReturnProperAnswerBasedIfInfinityOrNaN(answer);
numberOneBuffer = answerString;
inputTextBox.Text = numberOneBuffer;
}
}
private double OperateOneNumber(SingleCalcOperation currentSingleCalcOperation)
{
if (numberOneBuffer == String.Empty)
{
numberOneBuffer = "0";
if (currentCalcOperator != CalcOperator.None)
{
numberOneBuffer = inputTextBox.Text;
}
}
else if (numberOneBuffer != inputTextBox.Text)
{
numberOneBuffer = inputTextBox.Text;
}
CheckDecimal(numberOneBuffer);
double numberOne = Convert.ToDouble(numberOneBuffer);
double result;
switch (currentSingleCalcOperation)
{
case SingleCalcOperation.Factorial:
if (numberOne < 0)
{
result = Double.NaN;
}
else
{
double roundedNumberOne = Math.Floor(numberOne);
result = CalculateFactorial(roundedNumberOne);
}
break;
case SingleCalcOperation.Sine:
result = Math.Sin(numberOne);
break;
case SingleCalcOperation.Cosine:
result = Math.Cos(numberOne);
break;
case SingleCalcOperation.Tangent:
result = Math.Tan(numberOne);
break;
case SingleCalcOperation.Logarithm:
result = Math.Log(numberOne);
break;
case SingleCalcOperation.SquareRoot:
result = Math.Sqrt(numberOne);
break;
case SingleCalcOperation.TenToPowerOf:
result = Math.Pow(10, numberOne);
break;
case SingleCalcOperation.Squared:
result = Math.Pow(numberOne, 2);
break;
case SingleCalcOperation.Exponential:
result = Math.Exp(numberOne);
break;
default:
result = numberOne;
break;
}
return(result);
}
