static void Main(string[] args)

        {

            int[] scores = new int[5];

            int i,j;

            int temp;

            Console.WriteLine("请输入5个学员的成绩：");

            for (i = 0; i < 5; i++)

            {

                Console.WriteLine("请输入第{0}个学员的成绩",i + 1);

                scores[i] = int.Parse(Console.ReadLine());

            }

            for (i = 0; i < scores.Length -1; i++)

            {

                for (j = 0; j < scores.Length -1 - i; j++)

                {

                    if (scores[j] > scores[j+1])

                    {

                        temp = scores[j];

                        scores[j] = scores[j+1];

                        scores[j + 1] = temp;

                    }

                }

            }

            Console.WriteLine("排序后：");

            for (i = 0; i < scores.Length; i++)

            {

                Console.WriteLine("{0}\t",scores[i]);

            }

            Console.ReadLine();

        }

口诀（升序）：

N个数字来排序，两两相比小靠前

外层循环 I-1，内存循环 I-1-J

如果要降序，只把大于换小于