static void Main(string[] args)
{
Console.WriteLine("请输入打招呼的语言");
Program pr = new Program();
pr.S();
string Sayw = Console.ReadLine();
SayHello sh = GetSayHello(Sayw);
if (sh != null)
{
sh.Sayhello();
}
else
{
Console.WriteLine("输入有误");
}
Console.ReadKey();
}
