15-07-08 数组-- 去掉最低分去掉最高分取平均分

            Console.Write("请输入人数：");
            int r = Convert.ToInt32(Console.ReadLine());

            int[] cj = new int[r];

            if (r >= 5)
            {
                for (int i = 0; i < r; i++)
                {
                    Console.WriteLine("请输入第{0}个人的成绩", i + 1);
                    cj[i] = Convert.ToInt32(Console.ReadLine());
                }
                for (int a = 0; a < cj.Length - 1; a++)
                {
                    for (int b = 0; b < cj.Length - 1 - a; b++)
                    {
                        if (cj[b] >= cj[b + 1])
                        {
                            int zj = cj[b];
                            cj[b] = cj[b + 1];
                            cj[b + 1] = zj;
                        }
                    }
                }
                int sum = 0;
                for (int x = 0; x < cj.Length; x++)
                {
                    if (x == 0 || x == 1 || x == cj.Length - 1 || x == cj.Length - 2)
                    {
                    }
                    else
                    {
                        sum = sum + cj[x];
                    }

                }
                double pj = sum / (cj.Length - 4);
                Console.WriteLine("去掉两个最高分两个最低分之后的平均数为：" + pj);
            }

            else
            {
                Console.WriteLine("请输入的人数大于等于5！！！");
            }