private static void Main(string[] args)
{
var calc = new Calculator();
var a = 5;
var b = 8;
Console.WriteLine((calc as IMultiplyer).Calculate(a, b));
Console.WriteLine((calc as ISumator).Calculate(a, b));
var proCalc = new ProCalculator();
Console.WriteLine((proCalc as IMultiplyer).Calculate(a, b));
Console.WriteLine((proCalc as ISumator).Calculate(a, b));
Console.ReadKey();
}
public static void AllowPro()
{
Console.WriteLine("\nПлатная версия");
ProCalculator.GetSolution();
}