static void Main()
{
char toContinue = 'n';
do
{
int choice = 0;
int firstNumber = 0;
int secondNumber = 0;
ShowMenu();
choice = GetChoice();
firstNumber = GetParameter();
secondNumber = GetParameter();
string calculationResult = CalculationManager.Calculate(choice, firstNumber, secondNumber);
Console.WriteLine(calculationResult);
toContinue = Decide();
} while (toContinue != 'n' && toContinue == 'y');
//100 lines
}
