static void Main(string[] args)
{
string type = string.Empty;
double money = 0.0;
Console.WriteLine("请输入优惠方式：");
type = Console.ReadLine();
Context context = new Context(type);
Console.WriteLine("请输入总金额：");
money = Convert.ToDouble(Console.ReadLine());
Console.WriteLine("最后应该收费：" + context.finalPay(money));
Console.ReadKey();
}