去掉两个最高分、去掉两个最低分，求平均分

static void Main47求平均分(string[] args)
        {
            //去掉两个最高分，去掉两个最低分，求平均分
            Console.WriteLine("请输入分数的个数：");
            int a = Convert.ToInt32(Console.ReadLine());

            int [] fs = new int [a]; 

            if (a < 5)
            {
                Console.WriteLine("输入的分数至少为5个！");
            }
            else
            {
                for (int i = 0; i < a; i++)
                {
                    Console.WriteLine("请输入第{0}个分数：",i+1);
                    fs[i] = Convert.ToInt32(Console.ReadLine());
                }

                //排序
                for (int j = 0; j < fs.Length - 1; j++)
                {
                    for (int k = 0; k < fs.Length - 1 - j; k++)
                    {
                        if (fs[k] <= fs[k + 1])
                        {
                            int zj = fs[k];
                            fs[k] = fs[k + 1];
                            fs[k + 1] = zj;
                        }
                    }
                }

                //求平均分

                int sum = 0;
                for (int x = 0; x < fs.Length; x++)
                {
                    if (x == 0 || x == 1 || x == fs.Length - 1 || x == fs.Length - 2)
                    {
                    }
                    else
                    {
                        sum = sum + fs[x];
                    }
                }

                int avg = sum/(fs.Length-4);

                Console.WriteLine("去掉两个最高分和两个最低分之后的平均数为："+avg);

            }
        }