static void Main()
        {
           double t = 10.12;
          
            Console.WriteLine("这是double数据类型{0}",t);
            Console.ReadKey();
        }

static void Main()
        {
           double t = 10*1.0/3;//自动类型转换
          
            Console.WriteLine("控制输出两位小数{0:0.00}",t);
            Console.ReadKey();
        }