static void Main(string[] args) { Smartphone sp; IFounder founder; IOffice office; sp = new Huawei(); founder = new IHuawei(); office = new IHuawei(); founder.Founder(); office.officeAddress(); sp.subBrand(); sp.OS(); sp.Games(); sp.Calling(); sp.Internet(); Console.WriteLine(); sp = new OPPO(); founder = new IOPPO(); office = new IOPPO(); founder.Founder(); office.officeAddress(); sp.subBrand(); sp.OS(); sp.Games(); sp.Calling(); sp.Internet(); Console.WriteLine(); sp = new Xiaomi(); founder = new IXiaomi(); office = new IXiaomi(); founder.Founder(); office.officeAddress(); sp.subBrand(); sp.OS(); sp.Games(); sp.Calling(); sp.Internet(); Console.ReadKey(); }