传值、传址 结构体

 传值：将变量名中存放的值进行传输
 传址：将这个变量名直接传输过去，
 若在另一边有赋值情况，这边的值会发生变化

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

将变量名中存放的值进行传输

private void 传址(int a, out int b)
        {
            b = a + 10;
        }
        static void Main(string[] args)
        {
                Program hs = new Program();
                int a = 0;
                int b = 0;
                hs.传址(a, out b);//b变
        }

将这个变量名直接传输过去

out传址

 public void hanshu1(int a , out int b)
        {
            b = a + 10; 
        }
            int a = 5;
            int rr;
            hanshu.hanshu1(a,out rr);
            Console.WriteLine(rr);

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;
        }

结构体
结构体：自定义类型    值类型一组变量的组合
定义位置 Class里面 main函数外面
结构体里面可以包含各种类型的数据

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

        struct Score
        {
            public double yufen;
            public double shufen;
            public double yingfen;
        }
        static void Main(string[] args)
        {
            //实例化结构体
            Student st = new Student();
            st.xuehao = 1001;
            st.name = "张三";
            st.sex = "男";
            st.score = 33;
        }

struct student
        {
            public int xuehao;
            public string name;
            public string xingbie;
            public double fenshu;
        }
        static void Main(string[] args)
        {
            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.xingbie = Console.ReadLine();
                Console.Write("请输入第{0}个学生的分数", (i + 1));
                sst.fenshu = double.Parse(Console.ReadLine());
                al.Add(sst);   
            }
            Console.WriteLine("所有人员名单输入完毕请按回车开始打印");
            Console.ReadLine();
            for (int i = 0; i < a;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}分数为{4}",(i+1),sst.xuehao,sst.name,sst.xingbie,sst.fenshu);
            }

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];
                        Console.Clear();
                        if (al.Count > 0)
                        {
                            for (int k = 0; k < al.Count; k++)
                            {
                                string[] yigou = (string[])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("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";
                                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";
                                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";
                                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";
                                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";
                                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
                                {
                                    int zong = 0;
                                    for (int k = 0; k < al.Count; k++)
                                    {
                                        string[] yigou = (string[])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])));
                                        zong += int.Parse(yigou[1]) * int.Parse(yigou[2]);
                                    }
                                    Console.Write("总价：" + zong + "元。请缴费：");
                                    int erjiao = 0;
                                    for (int l = 0; l == 0; )
                                    {
                                        int jiao = int.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();
                            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]);
                            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：");
                }
            } 

struct swe
        {/*
            public string chexing;
            public int jiage;
            public int mm;
            public double l;
        }
        static void Main(string[] args)
        {
            ArrayList al = new ArrayList();
            swe swe10 = new swe();
            swe10.chexing = "宝马320Li ";
            swe10.jiage = 38;
            swe10.mm = 2920;
            swe10.l = 6.9;
            al.Add(swe10);

            swe swe1 = new swe();
            swe1.chexing = "宝马520Li";
            swe1.jiage = 43;
            swe1.mm = 3108;
            swe1.l = 7.2;
            al.Add(swe1);

            swe swe2 = new swe();
            swe2.chexing = "宝马730Li ";
            swe2.jiage = 89;
            swe2.mm = 3210;
            swe2.l = 6.3;
            al.Add(swe2);

            swe swe3 = new swe();
            swe3.chexing = "奥迪A4L35TFSI  ";
            swe3.jiage = 31;
            swe3.mm = 2869;
            swe3.l = 6.2;
            al.Add(swe3);

            swe swe4 = new swe();
            swe4.chexing = "奥迪A6L30TFSI";
            swe4.jiage = 43;
            swe4.mm = 3012;
            swe4.l = 7.6;
            al.Add(swe4);

            swe swe5 = new swe();
            swe5.chexing = "奥迪A8L45TFSI";
            swe5.jiage = 89;
            swe5.mm = 3122;
            swe5.l = 8.1;
            al.Add(swe5);

            swe swe6 = new swe();
            swe6.chexing = "奔驰C200L ";
            swe6.jiage = 35;
            swe6.mm = 2920;
            swe6.l = 6.1;
            al.Add(swe6);

            swe swe7 = new swe();
            swe7.chexing = "奔驰E260L  ";
            swe7.jiage = 48;
            swe7.mm = 3014;
            swe7.l = 6.7;
            al.Add(swe7);

            swe swe8 = new swe();
            swe8.chexing = "奔驰S320L ";
            swe8.jiage = 93;
            swe8.mm = 3165;
            swe8.l = 8;
            al.Add(swe8);

            for (int i = 0; i < 8; i++)
            {
                for (int j = i + 1; j < 9; j++)
                {
                    if (((swe)al[i]).jiage < ((swe)al[j]).jiage)
                    {
                        object zhong = al[i];
                        al[i] = al[j];
                        al[j] = zhong;
                    }
                }
            }
            //所有在售车辆中最便宜的
            Console.WriteLine("在售车辆中最便宜的{0}", ((swe)al[8]).chexing);
            Console.WriteLine("-----------------------------------------------------------------------------------------");

            //求宝马中最便宜的车型是什么，所有信息列出
            ArrayList al1 = new ArrayList();
            for (int i = 0; i < 9; i++)
            {
                swe sk = new swe();
                sk = (swe)al[i];
                if (sk.chexing.Contains("宝马"))
                {
                    al1.Add(sk);
                }
            }
            for (int i = 0; i < al1.Count - 1; i++)
            {
                for (int j = i + 1; j < al1.Count; j++)
                {
                    if (((swe)al1[i]).jiage > ((swe)al1[j]).jiage)
                    {
                        object zhong = al1[i];
                        al1[i] = al1[j];
                        al1[j] = zhong;
                    }
                }
            }
            Console.WriteLine("宝马中最便宜的车型{0}", ((swe)al1[0]).chexing);
            Console.WriteLine("-----------------------------------------------------------------------------------------");

            //选个轴距最长的
            for (int i = 0; i < 8; i++)
            {
                for (int j = i + 1; j < 9; j++)
                {
                    if (((swe)al[i]).mm < ((swe)al[j]).mm)
                    {
                        object zhong = al[i];
                        al[i] = al[j];
                        al[j] = zhong;
                    }
                }
            }
            Console.WriteLine("轴距最长的{0}", ((swe)al[0]).chexing);
            Console.WriteLine("-----------------------------------------------------------------------------------------");

            //选个轴距最长的，必须是奔驰
            ArrayList al2 = new ArrayList();
            for (int i = 0; i < 9; i++)
            {
                swe sk = new swe();
                sk = (swe)al[i];
                if (sk.chexing.Contains("奔驰"))
                {
                    al2.Add(sk);
                }
            }
            for (int i = 0; i < al1.Count - 1; i++)
            {
                for (int j = i + 1; j < al1.Count; j++)
                {
                    if (((swe)al2[i]).mm < ((swe)al2[j]).mm)
                    {
                        object zhong = al2[i];
                        al2[i] = al2[j];
                        al2[j] = zhong;
                    }
                }
            }
            Console.WriteLine("轴距最长的{0}", ((swe)al2[0]).chexing);
            Console.WriteLine("-----------------------------------------------------------------------------------------");

            //想要一辆油耗最低的车
            for (int i = 0; i < 8; i++)
            {
                for (int j = i + 1; j < 9; j++)
                {
                    if (((swe)al[i]).l < ((swe)al[j]).l)
                    {
                        object zhong = al[i];
                        al[i] = al[j];
                        al[j] = zhong;
                    }
                }
            }
            Console.WriteLine("油耗最低的车是{0}", ((swe)al[8]).chexing);
            Console.WriteLine("-----------------------------------------------------------------------------------------");
            Console.WriteLine("油耗最高的车是{0}", ((swe)al[0]).chexing);
            Console.WriteLine("-----------------------------------------------------------------------------------------");

            //想要一辆油耗最低的奥迪车
            ArrayList al3 = new ArrayList();
            for (int i = 0; i < 9; i++)
            {
                swe sk = new swe();
                sk = (swe)al[i];
                if (sk.chexing.Contains("奥迪"))
                {
                    al3.Add(sk);
                }
            }
            for (int i = 0; i < al3.Count - 1; i++)
            {
                for (int j = i + 1; j < al3.Count; j++)
                {
                    if (((swe)al3[i]).l > ((swe)al3[j]).l)
                    {
                        object zhong = al3[i];
                        al3[i] = al3[j];
                        al3[j] = zhong;
                    }
                }
            }
            Console.WriteLine("油耗最低的奥迪车{0}", ((swe)al3[0]).chexing);
            Console.WriteLine("-----------------------------------------------------------------------------------------");

            //我只有50万，看看能买什么车
            for (int i = 0; i < 9; i++)
            {
                swe sk = (swe)al[i];
                if (sk.jiage < 50)
                {
                    Console.WriteLine("小于50万的车有{0}价格{1}轴距{2}油耗{3}", sk.chexing, sk.jiage, sk.mm, sk.l);
                    Console.WriteLine("-----------------------------------------------------------------------------------------");
                }
            }
            //我只需要60万以上的车，列出来所有车型和所有信息
            for (int i = 0; i < 9; i++)
            {
                swe sk = (swe)al[i];
                if (sk.jiage > 60)
                {
                    Console.WriteLine("大于60万的车有{0}----价格{1}----轴距{2}----油耗{3}", sk.chexing, sk.jiage, sk.mm, sk.l);
                    Console.WriteLine("-----------------------------------------------------------------------------------------");
                }
            }
            //轴距必须超过3m
            for (int i = 0; i < 9; i++)
            {
                swe sk = (swe)al[i];
                if (sk.mm > 3000)
                {
                    Console.WriteLine("轴距超过三米的{0}----价格{1}----轴距{2}----油耗{3}", sk.chexing, sk.jiage, sk.mm, sk.l);
                    Console.WriteLine("-----------------------------------------------------------------------------------------");
                }
            }

             //油耗在8.5以下都行，列列表
            for (int i = 0; i < 9; i++)
            {
                swe sk = (swe)al[i];
                if (sk.l < 8.5)
                {
                    Console.WriteLine("耗在8.5以下的{0}----价格{1}----轴距{2}----油耗{3}", sk.chexing, sk.jiage, sk.mm, sk.l);
                    Console.WriteLine("-----------------------------------------------------------------------------------------");
                }
            }*/