private BaseOperation OperationFactory(string operation)
{
BaseOperation resultOperation = null;
switch (operation)
{
case ("+"):
resultOperation = new Addition();
break;
case ("-"):
resultOperation = new Subtraction();
break;
case ("*"):
resultOperation = new Multiplication();
break;
case ("/"):
resultOperation = new Division();
break;
default:
throw new InvalidInputException("Operation you entered is not recognized. Please, try again");
}
return(resultOperation);
}
public void SetInputsForMathOperation(BaseOperation operation)
{
double input_1;
double input_2;
if (UseLastValue)
{
operation.A = LastResult;
}
else
{
try
{
input_1 = GetOperand("Input 1st number: ");
}
catch (InvalidInputException e)
{
Console.WriteLine(e.Message);
input_1 = GetOperand("Input 1st number: ");
}
operation.A = input_1;
}
try
{
input_2 = GetOperand("Input 2nd number: ");
}
catch (InvalidInputException e)
{
Console.WriteLine(e.Message);
input_2 = GetOperand("Input 2nd number: ");
}
operation.B = input_2;
}
