传值、传址、结构体

传值：将变量名中存放的值进行传输

private void 传值(int a)
        {
            a += 10;
        }
        static void Main(string[] args)
        {
                //实例化   初始化   这个类
                Program hs = new Program();
                int a = 0;
                hs.传值(a);//a不变
        }  

以上使用out传址 打印出来的值是15

但如果需要函数返回多个值时，可以用减号拼接起来，返回后用split分割开

public string Fanhui(string name , string sex,int age)
        {
            age += 10;
            return name + "-"+sex +"-"+ age;
        }

string s = hanshu.Fanhui("张三", "男", 33);
            string[] aa = s.Split('-');
            foreach (string q in aa)
            {
                Console.WriteLine(q);
            }

结构体：自定义类型 值类型
一组变量的组合
需要定义的位置 class里面 main函数外面
里面包含的变量可以是多种数据类型的

例：学生信息的结构体：学号  姓名 性别 分数：

struct Student
        {
            public int xuehao;
            public string name;
            public string sex;
            public Score score;
        }

ArrayList al = new ArrayList();
            Console.Write("请输入班级人数：");
            int a = int.Parse(Console.ReadLine());
            for (int i = 0; i < a; i++)
            {
                Student sst = new Student();
                Console.Write("请输入第{0}个学生的学号：", (i + 1));
                sst.xuehao = int.Parse(Console.ReadLine());
                Console.Write("请输入第{0}个学生的姓名：", (i + 1));
                sst.name = Console.ReadLine();
                Console.Write("请输入第{0}个学生的性别：", (i + 1));
                sst.sex = Console.ReadLine();
                Console.Write("请输入第{0}个学生的分数：", (i + 1));
                sst.score = double.Parse(Console.ReadLine());
                al.Add(sst);
            }
            Console.WriteLine("所有人员信息输入完毕！请按回车键开始打印！");
            Console.ReadLine();

            for (int i = 0; i < al.Count; i++)
            {
                Student sst = (Student)al[i];
                Console.WriteLine("第{0}个学生的学号是：{1}，姓名是{2}，性别是{3}，分数是{4}。", (i + 1), sst.xuehao, sst.name, sst.sex, sst.score);
            }

存储下经典题目：

练习：超市购物问题

去超市选择要购买的商品            

0.开始购买            

1.洗发水   15元            

2.牙刷      5元            

3.可口可乐 3元            

4.水杯      12元            

5.毛巾      6元            

6.结算

输入想要的物品编号，输入每种商品需要买几件

结算：需要列出来商品名称、单价、数量、

总价以及所有物品总价，结账时间

然后输入交给收银员的钱数，

不够，请继续交钱

够，结算，找钱

 Console.WriteLine("0.开始购买");
            //Console.WriteLine("1.洗发水      15元");
            //Console.WriteLine("2.牙刷        5元");
            //Console.WriteLine("3.可口可乐    3元");
            //Console.WriteLine("4.水杯        12元");
            //Console.WriteLine("5.毛巾        6元");
            Console.WriteLine("6.结算（退出）");

            Console.Write("请输入号码：");
            for (int i = 0; i == 0; )
            {
                int aa = int.Parse(Console.ReadLine());
                if (aa == 0)
                {

                    ArrayList al = new ArrayList();
                    int biao1 = 0;
                    for (int j = 0; j == 0; )
                    {
                        bool biaocuo = true;
                        //string[] array = new string[3];
                        Shop array = new Shop();
                        Console.Clear();
                        if (al.Count > 0)
                        {
                            for (int k = 0; k < al.Count; k++)
                            {
                                //string[] yigou = (string[])al[k];
                                Shop yigou = (Shop)al[k];
                                //Console.WriteLine("您选择了{0}，单价为{1}元，数量为{2}。", yigou[0], yigou[1], yigou[2]);
                                Console.WriteLine("您选择了{0}，单价为{1}元，数量为{2}。", yigou.name, yigou.price, yigou.shuliang);
                            }
                        }
                        Console.WriteLine("1.洗发水      15元");
                        Console.WriteLine("2.牙刷        5元");
                        Console.WriteLine("3.可口可乐    3元");
                        Console.WriteLine("4.水杯        12元");
                        Console.WriteLine("5.毛巾        6元");
                        Console.WriteLine("6.结算");

                        Console.Write("请输入选项：");
                        int aaa = int.Parse(Console.ReadLine());
                        switch (aaa)
                        {
                            case 1:
                                //array[0] = "洗发水";
                                //array[1] = "15";
                                array.name = "洗发水";
                                array.price = 15;
                                biao1++;
                                Console.Write("您选择的是洗发水，请问您需要多少瓶？");
                                break;
                            case 2:
                                //array[0] = "牙刷";
                                //array[1] = "5";
                                array.name = "牙刷";
                                array.price = 5;
                                biao1++;
                                Console.Write("您选择的是牙刷，请问您需要多少支？");
                                break;
                            case 3:
                                //array[0] = "可口可乐";
                                //array[1] = "3";
                                array.name = "可口可乐";
                                array.price = 3;
                                biao1++;
                                Console.Write("您选择的是可口可乐，请问您需要多少瓶？");
                                break;
                            case 4:
                                //array[0] = "水杯";
                                //array[1] = "12";
                                array.name = "水杯";
                                array.price = 12;
                                biao1++;
                                Console.Write("您选择的是水杯，请问您需要多少个？");
                                break;
                            case 5:
                                //array[0] = "毛巾";
                                //array[1] = "6";
                                array.name = "毛巾";
                                array.price = 6;
                                biao1++;
                                Console.Write("您选择的是毛巾，请问您需要多少块？");
                                break;
                            case 6:
                                if (biao1 == 0)
                                {
                                    Console.Clear();
                                    Console.WriteLine("您什么也没有购买，您已经走出了超市。。。");
                                    j = 1;
                                    i = 1;
                                }
                                else
                                {
                                    double zong = 0;
                                    for (int k = 0; k < al.Count; k++)
                                    {
                                        //string[] yigou = (string[])al[k];
                                        Shop yigou = (Shop)al[k];
                                        //Console.WriteLine("您选择了{0}，单价为{1}元，数量为{2}，单品总价：{3}。", yigou[0], yigou[1], yigou[2], (int.Parse(yigou[1]) * int.Parse(yigou[2])));
                                        Console.WriteLine("您选择了{0}，单价为{1}元，数量为{2}，单品总价：{3}。", yigou.name, yigou.price, yigou.shuliang, yigou.price*yigou.shuliang);
                                        //zong += int.Parse(yigou[1]) * int.Parse(yigou[2]);
                                        zong += yigou.price * yigou.shuliang;
                                    }
                                    Console.Write("总价：" + zong + "元。请缴费：");
                                    double erjiao = 0;
                                    for (int l = 0; l == 0; )
                                    {
                                        double jiao = double.Parse(Console.ReadLine());
                                        jiao += erjiao;
                                        if (jiao >= zong)
                                        {
                                            Console.WriteLine("交易成功，交易时间为：" + DateTime.Now);
                                            Console.WriteLine("找零：" + (jiao - zong) + "元。");
                                            Console.WriteLine("谢谢惠顾！再见！");
                                            l = 1;
                                            j = 1;
                                            i = 1;
                                        }
                                        else
                                        {
                                            erjiao = jiao;
                                            Console.Write("缴费金额不足，请继续缴费：");
                                        }
                                    }
                                }
                                break;
                            default:
                                Console.WriteLine("查无此商品！请按回车键继续选择商品！");
                                Console.ReadLine();
                                biaocuo = false;
                                break;
                        }
                        if (i == 0 && j == 0 && biaocuo == true)
                        {
                            //array[2] = Console.ReadLine();
                            array.shuliang = int.Parse(Console.ReadLine());
                            //Console.WriteLine("您选择了{0}，单价为{1}元，数量为{2}。请按回车键继续购买！", array[0], array[1], array[2]);
                            Console.WriteLine("您选择了{0}，单价为{1}元，数量为{2}。请按回车键继续购买！", array.name, array.price, array.shuliang);
                            al.Add(array);
                            Console.ReadLine();
                        }
                    }
                }
                else if (aa == 6)
                {
                    Console.Clear();
                    Console.WriteLine("您什么也没有购买！您已走出超市。。。");
                    i = 1;
                }
                else
                {
                    Console.Write("输入有误！请重新输入：");
                }
            }