输入班级人数，根据人数，挨个输入成绩，求平均分,求最高分最低分

  Console.Write("请输入班级人数：");
            int n = int.Parse(Console.ReadLine());
            double [] fenshu=new double[n];
            double  sum = 0;
            for (int i = 0; i < n;i++ )
            {
                Console.Write("请输入第"+(i+1)+"个分数:");
                fenshu[i]=double.Parse(Console.ReadLine());
                sum+=fenshu[i];               
            }
            for (int i = 0; i < n; i++)
            {
                for (int j = i; j < n - 1; j++)
                {
                    if (fenshu[i] < fenshu[j + 1])
                    {
                        double zhong = fenshu[i];
                        fenshu[i] = fenshu[j + 1];
                        fenshu[j + 1] = zhong;
                    }                
                }
            }
            Console.WriteLine("全班最高分是："+fenshu[0]+"分");
            Console.WriteLine("全班最低分是："+fenshu[n - 1]+"分");
            Console.WriteLine("班级平均分是："+(sum/n)+"分");

            Console.ReadLine();