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();
}
