20150306

打闹钟时间编程 DateTime dt = new DateTime();             dt = DateTime.Now;             string t = "2015-3-6 10:00";             DateTime x = Convert.ToDateTime(t);             while (true)             {                 if (dt>=x)                 {                     Console.WriteLine("您该看新闻联播了！");                     Console.WriteLine("是否关闭闹钟  Y/N");                     Console.ReadLine();                     if (t=="N")                     {                         x = x.AddMinutes(5);                     }                     else                     {                         break;                     }

                }                 else                 {                     dt = dt.AddMinutes(1);                     Console.WriteLine("现在时间" + dt);

                }             }             Console.ReadLine();

用int做闹钟 int x = 0;             int y = Convert.ToInt32(Console.ReadLine());             while (true)             {                 if (x>=y)                 {                     Console.WriteLine("您该看新闻联播了！");                     Console.WriteLine("是否关闭闹钟 Y/N");                     string x1=Console.ReadLine();                     if (x1=="Y")                     {                         break;                     }                     else                     {                         Console.WriteLine("当前的停止条件="+y+"修改后的="+(y+5));                         y += 5;                     }                                   }                 else                 {

                    Console.WriteLine("xianzai" + x);                     x++;                 }                             }             Console.ReadLine();

一、数组 （一）一维数组  while (true)          {                  string[] weekdays = new string[] { "周一", "周二", "周三", "周四", "周五", "周六", "周日" };             int day = Convert.ToInt32(Console.ReadLine());             if (day<=weekdays.Length)             {                 Console.WriteLine(weekdays[day-1]);             }             else             {                 Console.WriteLine("超出长度");             }          }             Console.ReadLine();

  while (true)             {                 int[] weekdays = new int[8];                 for (int i = 0; i < 8; i++)                 {                     weekdays[i] = i;                     Console.WriteLine((weekdays[i]));                 }                 Console.ReadLine();             } （二）二维数组 定义二维数组int[,]x=new int{几个一维数组,数组中的个数} 赋值循环   打工字！！ string[,] a = new string[5,5] ;                     for (int i = 0; i <5; i++)           {               for (int i1 = 0; i1 <5; i1++)               {                   Console.WriteLine("请为下标["+i+","+i1+"]的数值"+a[i,i1]);                                    if (i==0||i1==2||i==4)                   {                       a[i, i1] = "◎";                   }                   else                   {                       a[i, i1] = "  ";                   }               }           }           for (int i = 0; i <5; i++)           {               for (int i1 = 0; i1 <5; i1++)               {                   Console.Write(a[i,i1]);               }               Console.Write("\n");           }                    Console.ReadLine();

（三）多维数组 in[,,] x=new int 输入10个人的分数，去掉两个最高两个最低分，求平均分、  Console.WriteLine("输入人数 ");             int r = Convert.ToInt32(Console.ReadLine());             int[] c = new int[r];             if (r>=5)//             {                 for (int h = 0; h < r; h++)//                 {                     Console.WriteLine("输入第"+h+"个人成绩");                     c[h] = Convert.ToInt32(Console.ReadLine());                 }                 for (int i = 0; i <r; i++)                 {                     for (int j = 0; j <r-1; j++)                     {                         if (c[i]<c[j+1])//冒泡排序，由大到小                         {                             int z = 0;                             z = c[i];                             c[j] = c[i];                             c[j + 1] = z;                         }                     }                 }                 int he = 0;                 for (int i = 0; i <r-1; i++)                 {                     he = he + c[i];                 }                 double pj=(he-c[0]-c[1]-c[r-2]-c[r-1])/(r-4);                 Console.WriteLine("去掉两个最高分｛0｝、｛1｝,去掉两个最低分｛2｝,｛3｝,最后平均分：｛4｝",c[0],c[1],c[r-1],c[r-2],pj);             }             else             {                 Console.WriteLine("输入的人数>=5!!");             }             Console.ReadLine();