/// <summary>
/// Performs arithmetic calculation depending on operator.
/// </summary>
/// <returns>Calculation result</returns>
/// <exception cref="System.NotSupportedException">Thrown in case of operator is not recognized</exception>
private double MakeArithmeticCalculation()
{
if (Operator == OperatorType.Addition)
{
return(ArithmeticCalculator.Add((double)FirstOperand, (double)SecondOperand));
}
else if (Operator == OperatorType.Subtraction)
{
return(ArithmeticCalculator.Subtract((double)FirstOperand, (double)SecondOperand));
}
else if (Operator == OperatorType.Multiplication)
{
return(ArithmeticCalculator.Multiply((double)FirstOperand, (double)SecondOperand));
}
else if (Operator == OperatorType.Division)
{
try
{
return(ArithmeticCalculator.Divide((double)FirstOperand, (double)SecondOperand));
}
catch (System.DivideByZeroException)
{
State = ExecutorState.Error;
return(0);
}
}
else if (Operator == OperatorType.Inversion)
{
try
{
return(ArithmeticCalculator.Invert((double)FirstOperand));
}
catch (System.DivideByZeroException)
{
State = ExecutorState.Error;
return(0);
}
}
else if (Operator == OperatorType.SquareRoot)
{
try
{
return(ArithmeticCalculator.SquareRoot((double)FirstOperand));
}
catch (SquareRootOfNegativeException)
{
State = ExecutorState.Error;
return(0);
}
}
throw new System.NotSupportedException("unknown operation type");
}