数组（二维数组，锯齿数组）

二维数组的定义

 /*二维数组*/
            //定义了2行3列的二维数组
            //int[,] arr = new int[2, 3];

            int[,] arr = { { 1, 2, 3 }, { 4, 5, 6 } };

锯齿数组的定义

 /*
             * 锯齿数组
             */

            string[][] arr = new string[3][];
            arr[0] = new string[] {"南昌","九江" };
            arr[1]=new string[]{"苏州","无锡","南京"};
            arr[2] = new string[] { "合肥", "芜湖", "滁州","六安" };