public static IOperation Create(decimal firstNumber, decimal secondNumber, string operatorValue)
{
IOperation operation = null;
switch (operatorValue)
{
case OperatorSymbols.Addition:
operation = new SumOperation(firstNumber, secondNumber);
break;
case OperatorSymbols.Substraction:
operation = new SubstractOperation(firstNumber, secondNumber);
break;
case OperatorSymbols.Multiplication:
operation = new MultiplyOperation(firstNumber, secondNumber);
break;
case OperatorSymbols.Division:
operation = new DivideOperation(firstNumber, secondNumber);
break;
default:
throw new InvalidOperationException("Invalid operator");
}
return(operation);
}
static void Main(string[] args)
{
bool exitLoop = true;
bool isInputCorrect;
IMathOperations mathOperations;
do
{
Console.WriteLine("Choose operation:");
Console.WriteLine("1. Add.");
Console.WriteLine("2. Subtract.");
Console.WriteLine("3. Multiply.");
Console.WriteLine("4. Divide.");
Console.WriteLine("0. Quit.\n");
isInputCorrect = int.TryParse(Console.ReadLine(), out int caseChoice);
if (isInputCorrect)
{
mathOperations = new NullOperation();
switch (caseChoice)
{
case 1:
mathOperations = new SumOperation();
break;
case 2:
mathOperations = new SubtractionOperation();
break;
case 3:
mathOperations = new MultiplyOperation();
break;
case 4:
mathOperations = new DivideOperation();
break;
case 0:
exitLoop = false;
break;
default:
PrintNoOptionSelected();
break;
}
mathOperations.MathOperation();
}
else
{
PrintNoOptionSelected();
}
} while (exitLoop);
}