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数组 一、一位数组 数组初始化，创建数组,数组长度为5 int[] array = new int[5]; array[0] = 1; array[1] = 2; array[2] = 3; array[3] = 4; array[4] = 5; 将2号索引位置改成7 array[2] = 7; 查看3号索引位置是什么值 Console.WriteLine(array[3]); 把4号索引位置的值赋值给a int a = array[4]; 将1号索引位置的值变成控制台输入 array[1] = int.Parse(Console.ReadLine()); Console.ReadLine(); 直接赋值的数组 int[] array1 = new int[] { 1, 2, 3, 4, 5 }; 存放5个人的人名 string [] name=new string [5]; for (int i = 1; i <= 5; i++) { Console.Write("请输入第"+i+"个人的名字"); name[i - 1] = Console.ReadLine(); } 查看第三个人的名字 Console.WriteLine(name[2]); 将每个人的姓名都打印出来 for (int i = 0; i < 5; i++) { Console.WriteLine(name[i]); } Console.ReadLine(); 例题：1、输入班级人数，输入每个人的分数，求平均分 Console.Write("请输入班级人数："); int a = int.Parse(Console.ReadLine ()); double [] fen =new double [a]; for (int i = 0; i < a; i++) { Console.Write("请输入第"+(i+1)+"人的分数"); fen[i] = double.Parse(Console.ReadLine ()); } double sum = 0; for (int i = 0; i < a; i++) { sum += fen[i]; } Console.WriteLine("平均分是："+(sum/a)); Console.ReadLine(); 2、从控制台输入班级人数，每个人的年龄放入数组，将所有的年龄求总和 Console.Write("输入班级人数："); int a = int.Parse(Console.ReadLine()); int[] b = new int[a]; for (int i = 0; i < a; i++) { Console.Write("输入第" + (i + 1) + "个人的年龄"); b[i] = int.Parse(Console.ReadLine()); } int sum = 0; for (int i = 0; i < a; i++) { sum += b[i]; } Console.WriteLine("年龄总和：" + sum); Console.ReadLine(); 二、二维数组 int [,] shuzu =new int [3,4]; 3 表示3个一位数组 4 表示每一个一位数组中有4个元素 给第一个一位数组的2号索引赋值 shuzu[0, 2] = 3; 直接赋值 int[,] shuzu1 = new int[,] { {1,2,3,4 }, {2,3,4,5 }, {3,4,5,6 } }; 例题：1、根据二维数组，打印一个“王” string[,] wang = new string[7, 7] { {" ","★","★","★","★","★",""}, {" "," "," ","★","","",""}, {" "," "," ","★","","",""}, {" "," ","★","★","★","",""}, {" "," "," ","★","","",""}, {" "," "," ","★","","",""}, {"★","★","★","★","★","★","★"}, }; //打印出王 for (int i = 0; i < 7; i++) { for (int j = 0; j < 7; j++) { Console.Write(wang[i,j]); } Console.WriteLine(); } Console.ReadLine(); 2、输入班级人数，存放每个人的语、数、英成绩进入数组，求每个人的总分，求班级语文总分，数学平均分 法一、 Console.Write("输入班级人数："); int a = int.Parse(Console.ReadLine()); double[,] fen = new double[a, 3]; for (int i = 0; i < a; i++) { Console.Write("输入第" + (i + 1) + "个人的语文分数"); fen[i, 0] = double.Parse(Console.ReadLine()); Console.Write("输入第" + (i + 1) + "个人的数学分数"); fen[i, 1] = double.Parse(Console.ReadLine()); Console.Write("输入第" + (i + 1) + "个人的英语分数"); fen[i, 2] = double.Parse(Console.ReadLine()); } double sum = 0, sum1 = 0, sum2 = 0; for (int i = 0; i < a; i++) { sum = 0; for (int j = 0; j < 3; j++) { sum += fen[i, j]; } sum1 += fen[i, 0]; sum2 += fen[i, 1]; Console.WriteLine("第" + (i + 1) + "个人的分数总和是" + sum); } Console.WriteLine("语文总和是" + sum1); Console.WriteLine("数学平均分是" + (sum2 / a)); Console.ReadLine(); 法二、 Console.Write("输入班级人数："); int a = int.Parse(Console.ReadLine()); double[,] fen = new double[a, 3]; for (int i = 0; i < a; i++) { Console.Write("输入第" + (i + 1) + "个人的语文分数"); fen[i, 0] = double.Parse(Console.ReadLine()); Console.Write("输入第" + (i + 1) + "个人的数学分数"); fen[i, 1] = double.Parse(Console.ReadLine()); Console.Write("输入第" + (i + 1) + "个人的英语分数"); fen[i, 2] = double.Parse(Console.ReadLine()); } double[] zong = new double[a]; for (int i = 0; i < a; i++) { zong[i] = fen[i, 0] + fen[i, 1] + fen[i, 2]; Console.WriteLine("第{0}个人的总分是：{1}", (i + 1), zong[i]); } double yuzong = 0, shuzong = 0; for (int i = 0; i < a; i++) { yuzong += fen[i, 0]; shuzong += fen[i, 1]; } Console.WriteLine("语文总分是：" + yuzong); Console.WriteLine("数学平均分是：" + (shuzong / a)); Console.ReadLine(); 三、冒泡排序 例题：1、从控制台输入班级人数，每个人的年龄放入数组，冒泡排序，求年龄最大。 Console.Write("输入班级人数："); int a = int.Parse(Console.ReadLine()); int[] b = new int[a]; for (int i = 0; i < a; i++) { Console.Write("输入第" + (i + 1) + "个人的年龄"); b[i] = int.Parse(Console.ReadLine()); } 冒泡排序:固定格式，记住，背过 for (int i = 0; i < a; i++) { for (int j = i; j < a - 1; j++) { if (b[i] < b[j + 1])//从大到小 { int zhong = b[i]; b[i] = b[j + 1]; b[j + 1] = zhong; } } } for (int i = 0; i < a; i++) { Console.WriteLine(b[i]); } Console.ReadLine(); 2、从1-100内随机选10个不同的数做一个数组，对10个数排序，从小到大 法一、 int[] ss = new int[10]; Random s = new Random(); for (int i = 0; i < 10; i++) { ss[i] = s.Next(1, 100); for (int j = 0; j < i; j++) { if (ss[i] == ss[j]) { i--; } } } for (int i = 0; i < 10; i++) { Console.WriteLine(ss[i]); } Console.WriteLine(); for (int i = 0; i < 10; i++) { for (int j = i; j < 9; j++) { if (ss[i] > ss[j + 1])//从大到小 { int zhong = ss[i]; ss[i] = ss[j + 1]; ss[j + 1] = zhong; } } } for (int i = 0; i < 10; i++) { Console.WriteLine(ss[i]); } Console.ReadLine(); 法二、 int[] ss = new int[10]; Random s = new Random(); for (int i = 0; i < 10; i++) { bool b = true; int a = s.Next(101); for (int j = 0; j < i; j++) { if (a == ss[j]) { b = false; i--; } } if (b) { ss[i] = a; } Console.WriteLine(ss[i]); } Console.WriteLine(); for (int i = 0; i < 10; i++) { for (int j = i; j < 9; j++) { if (ss[i] > ss[j + 1])//从大到小 { int zhong = ss[i]; ss[i] = ss[j + 1]; ss[j + 1] = zhong; } } } for (int i = 0; i < 10; i++) { Console.WriteLine(ss[i]); } Console.ReadLine(); 四、抽奖问题 输入每个人的中奖号码，进行滚动显示 //清屏 //随即一个索引 // 根据索引打印 //等待0.1秒 Console.Write("请输入参与人的总数："); int a = int.Parse(Console.ReadLine ()); string []jiang=new string [a]; for (int i = 0; i < a; i++) { Console.Write("请输入第{0}个人的手机号码：",(i+1)); jiang[i] = Console.ReadLine(); } Console.WriteLine("所有人的手机号码输入完毕。请按回车键！"); Console.ReadLine(); Random ran = new Random(); for (int i = 0; i < 30; i++) { Console.Clear(); int aa = ran.Next(a); Console.WriteLine("中奖号码："+jiang[aa]); System.Threading.Thread.Sleep(100);//等待100毫秒 } //作弊！！！！！！ //Console.Clear(); //Console.WriteLine("中奖号码：" + 14351571); Console.ReadLine(); |
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