public static void Main(string[] args)
{
var userInteraction = new ProgramUserInteraction();
userInteraction.GreetUser();
var calculatorFactory = new CalculatorFactory();
while (true)
{
var calculatorType = userInteraction.GetCalculatorType();
if (calculatorType == CalculatorType.None)
{
userInteraction.ExitProgram();
return;
}
var calculator = calculatorFactory.SelectCalculator(calculatorType);
if (calculator == null)
{
userInteraction.ReportInvalidCalculator();
}
else
{
calculator.GetCalculatorInput();
calculator.Calculate();
if (!userInteraction.IsMoreCalculatingRequested())
{
userInteraction.ExitProgram();
return;
}
}
}
}