Csharp+Asp.net系列教程（四）[5]

                    class mikecat
                    {
                        public static void main()
                        {
                            int r=3;
                            console.writeline("圆的面积等于{0}",r*r*math.pi);
                            console.writeline("类型是{0}",(r*r*math.pi).gettype());
                        }
                    }//圆的面积等于28.2743338823081
                    //类型是system.double
        16.sizeof操作符
                sizeof操作符获得一个值类型的字节大小
                        using system;
                        class mikecat