例题：用二维数组算总分，列出成绩表。

 while (true)
            {
                double[,] a = new double[3, 4];  //定义一个三行四列的二位数组
                for (int i = 0; i < 3; i++)     //循环输出三个人的成绩
                {
                    a[i, 0] = i + 1;           //显示学号
                    Console.Write("请输入第"+(i+1)+"个人的语文成绩：");
                    a[i, 1] = Convert.ToDouble(Console .ReadLine ());    //输入语文成绩
                    Console.Write("请输入第"+(i+1)+"个人的数学成绩：");
                    a[i, 2] = Convert.ToDouble(Console .ReadLine ());   //输入数学成绩
                    a[i, 3] = a[i, 1] + a[i, 2];                        //算出总分 
                }
                Console.WriteLine("最终结果是：");
                Console.WriteLine("学号"+"\t"+"语文"+"\t"+"数学"+"\t"+"总分");
                for (int i = 0; i < 3; i++)                  //输出三行四列
                {
                    for (int j = 0; j < 4; j++)
                    {
                        Console.Write(a[i,j]+"       ");      
                    }
                     Console.ReadLine();
            }
                }