3月13日 冒泡排序

//冒泡排序 从大到小排列
1.   //int []shuzu = new int[]{3,1,8,4,0,5,6};

     int []shuzu = new int[]{3,1,8,4,0,5,6};
            int zhong;
            for (int i = 0; i < 7; i++)
            {
                for (int j = i; j < 6; j++)
                {
                    if (shuzu[i] <shuzu[j + 1])
                    {
                        zhong = shuzu[i];
                        shuzu[i] = shuzu[j + 1];
                        shuzu[j + 1] = zhong;
                    } 
                }
            }
            //for (int i = 1; i < 7; i++)
            //{
            //    Console.WriteLine(shuzu[i]);
            //}
            foreach (int a in shuzu)
            {
                Console.WriteLine(a);
            }
            Console.ReadLine();

 

 

 

foreach(int a in shuzu)   //遍历数组   int也可以用object
{
/Console.WriteLine(a);
}

object是所有类的基类，可以接收任何数据类型

eg:   //object a = 1;
        //object b = "123";
       //object c = true;
      //object d = 3.14;

2.    //输入人数，输入每个人的成绩
      //需要最高分、最低分
     //去掉两个最高分，去掉两个最低分，求平均分。

            Console.Write("请输入人数：");
            int ren = int.Parse(Console.ReadLine());
            double[] chengji = new double[ren];
            if (ren >= 5)
            {
                for (int i = 0; i < ren; i++)
                {
                    Console.Write("请输入第" + (i + 1) + "个人的成绩：");
                    chengji[i] = double.Parse(Console.ReadLine());
                  
                }
                double zhong;
                for (int i = 0; i < ren; i++)
                {
                    for (int j = i; j < ren - 1; j++)
                    {
                        if (chengji[i] < chengji[j + 1])
                        {
                            zhong = chengji[i];
                            chengji[i] = chengji[j + 1];
                            chengji[j + 1] = zhong;
                        }
                    }
                }
                foreach (double a in chengji)
                {
                    Console.WriteLine(a);
                }
                double sum = 0;
                for (int i = 0; i < ren; i++)
                {
                    sum += chengji[i];
                }
                double pj = (sum - chengji[0] - chengji[1] - chengji[ren - 1] - chengji[ren - 2]) / (ren - 4);
                Console.WriteLine("去掉两个最高分" + chengji[0] + "、" + chengji[1] + ",去掉两个最低分" + chengji[ren - 2] + "、" + chengji[ren - 1], "");
                Console.WriteLine("他们的平均分是：" + pj);
             
            }
            else
            {
                Console.WriteLine("您的输入有误！");
            }
            Console.ReadLine();

 这个是复习昨天内容的练习题

随机输入手机号码，滚动起来，从中抽取一个获奖，5秒后停止。

  Console.Write("请输入手机号码数量：");
            int a = int.Parse(Console.ReadLine());
            string[] shuzu = new string[a];
            if (a >= 5)
            {
                for (int i = 0; i < a; i++)
                {
                    Console.Write("请输入第" + (i + 1) + "个手机号码：");
                    shuzu[i] = Console.ReadLine();
                }
                Console.WriteLine("请按回车键开始滚动");
                Console.ReadLine();
                Random ran = new Random();
                int j = 0;
                for (; ; j++)
                {
                    int b = ran.Next(a);
                    Console.Clear();
                    Console.WriteLine("中奖号码为："+shuzu[b]);
                    System.Threading.Thread.Sleep(100);
                    if (j == 49)
                    {

                        break;

                    }
                }
            }
            else
            {
                Console.WriteLine("您输入的手机号码数量太少！");
            }
           
            Console.ReadLine();