10月19日--传值传址结构体

Posted 2020-08-15

传值---传址

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
        }  

格式

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
        }

格式

 

 

 

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;
        }

格式

 

练习：

　　超市购物

            while (true)
            {
                Program hanshu = new Program();
                ArrayList al = new ArrayList();
                bool bo = true;
                Console.Write("请输入0开始购买：");
                try
                {
                    int bh = int.Parse(Console.ReadLine());

                    if (bh == 0 && bo)
                    {
                        Console.WriteLine("1.洗发水   15元\\n2.牙刷      5元\\n3.可口可乐 3元\\n4.水杯      12元\\n5.毛巾      6元\\n6.结算");
                        bo = false;
                    }else
                    {
                        Console.WriteLine("请输入0开始购买,输入回车从新选购");
                    }
                    if (!bo)
                    {
                        while (true)
                        {
                            Console.Write("请输入1~5进行选购、6结账：");
                            int wpbh = int.Parse(Console.ReadLine());
                            if (wpbh >= 1 && wpbh < 6)
                            {
                                //
                                gouwu st = new gouwu();
                                st.mingcheng = hanshu.biaonhaozhaoming(wpbh);
                                st.bianhao = wpbh;
                                Console.Write("请输入要购买" + st.mingcheng + "的数量：");
                                int wpsl = int.Parse(Console.ReadLine());

                                switch (wpbh)
                                {
                                    case 1:
                                        st.danjia = 15;
                                        break;
                                    case 2:
                                        st.danjia = 5;
                                        break;
                                    case 3:
                                        st.danjia = 3;
                                        break;
                                    case 4:
                                        st.danjia = 12;
                                        break;
                                    case 5:
                                        st.danjia = 6;
                                        break;
                                }
                                st.shuliang = wpsl;
                                al.Add(st);

                                Console.Clear();
                                if (al.Count > 0)
                                {

                                    int zongjia = 0;
                                    Console.WriteLine("┌───────────────────┐");
                                    Console.WriteLine("│物品名称\\t单价\\t数量\\t总价\\t│");
                                    for (int i = 0; i < al.Count; i++)
                                    {
                                        gouwu stt = (gouwu)al[i];
                                        Console.WriteLine("│" + stt.mingcheng + "\\t" + stt.danjia + "\\t" + stt.shuliang + "\\t" + (stt.danjia * stt.shuliang) + "\\t│");
                                        zongjia += stt.danjia * stt.shuliang;
                                    }
                                    Console.WriteLine("│　　　　　　　　　　　　　　　　　　　│");
                                    Console.WriteLine("│" + DateTime.Now.ToString() + "\\t应付总价：" + zongjia + "\\t│");
                                    Console.WriteLine("└───────────────────┘");
                                }
                                Console.WriteLine("1.洗发水   15元\\n2.牙刷      5元\\n3.可口可乐 3元\\n4.水杯      12元\\n5.毛巾      6元\\n6.结算");
                            }
                            else if (wpbh == 6)
                            {
                                Console.Clear();
                                if (al.Count > 0)
                                {
                                    int yifuzong = 0;
                                    int zongjia = 0;

                                    Console.WriteLine("┌───────────────────┐");
                                    Console.WriteLine("│物品名称\\t单价\\t数量\\t总价\\t│");
                                    for (int i = 0; i < al.Count; i++)
                                    {
                                        gouwu stt = (gouwu)al[i];
                                        Console.WriteLine("│" + stt.mingcheng + "\\t" + stt.danjia + "\\t" + stt.shuliang + "\\t" + (stt.danjia * stt.shuliang) + "\\t│");
                                        zongjia += stt.danjia * stt.shuliang;
                                    }
                                    Console.WriteLine("│　　　　　　　　　　　　　　　　　　　│");
                                    Console.WriteLine("│" + DateTime.Now.ToString() + "\\t应付总价：" + zongjia + "\\t│");
                                    Console.WriteLine("└───────────────────┘");
                                    while (zongjia != 0)
                                    {
                                        Console.Write("请输入钱数进行结账：");
                                        int fq = int.Parse(Console.ReadLine());
                                        zongjia -= fq;
                                        yifuzong += fq;
                                        if (zongjia < 0)
                                        {
                                            Console.WriteLine("您付了" + yifuzong + "元，找您" + Math.Abs(zongjia) + "元");
                                            zongjia = 0;
                                        }
                                        else if (zongjia > 0)
                                        {
                                            Console.WriteLine("您付了" + yifuzong + "元，还需要" + zongjia + "元");
                                        }
                                    }
                                    Console.WriteLine("谢谢光临，欢迎下次再来！");
                                }
                                else
                                {
                                    Console.WriteLine("您未购买任何东西无法结账");
                                }
                                break;
                            }
                            else
                            {
                                Console.WriteLine("请输入正确的编号");
                            }
                        }
                    }
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex);
                }
                    Console.ReadKey();
            }

答案：方式一