C# 用OO来实现超市的购买结账

た入场券 2024-02-17 16:45 15阅读 0赞

**一、如图所示：**

![Center][]![Center 1][]

**二、具体步骤：**

**1） 商品类(商品ID，商品Name,商品Price)**

class Goods
        {
            //商品编号
            private int id;
    
            public int Id
            {
                get { return id; }
                set { id = value; }
            }
    
            //商品名称
            private string name;
    
            public string Name
            {
                get { return name; }
                set { name = value; }
            }
    
            //单价
            private double price;
    
            public double Price
            {
                get { return price; }
                set { price = value; }
            }
        }

**2) 购物类(初始化商品，菜单，打印小票)**

<strong>    </strong>//商品数组
          Goods[] goods = new Goods[3];
    
            /// <summary>
            /// 初始化
            /// </summary>
            public void Initial()
            {
                goods[0] = new Goods();
                goods[0].Id = 1;
                goods[0].Name = "农夫山泉";
                goods[0].Price = 1.03;
    
                goods[1] = new Goods();
                goods[1].Id = 2;
                goods[1].Name = "方便面";
                goods[1].Price = 3.50;
    
                goods[2] = new Goods();
                goods[2].Id = 3;
                goods[2].Name = "火腿";
                goods[2].Price = 12.63;
    
            }
    
           /// <summary>
           /// 显示所有的商品
           /// </summary>
            public void ShowGoods()
            {
                Initial();
    
                Console.WriteLine("编号\t商品名\t\t单价");
                foreach (Goods item in goods)
                {
                    Console.WriteLine("{0,-4}\t{1,-8}\t{2:0.00}",item.Id,item.Name,item.Price);
                    
                }
                Console.WriteLine();
    
            }
    
    
            /// <summary>
            /// 菜单
            /// </summary>
            public void ShowMenu()
            {
                string buy = string.Empty;
    
                string str = "\n\n----------欢迎光临大润发超市----------";
                str = string.Format("{0}\n{1,-8}\t{2,-4:F2}\t{3,-4}\t{4,-4:F2}", str, "商品名称", "单价", "数量", "小计");
    
                double sum = 0;
    
                do
                {
    
                    Console.Write("输入商品编号：");
                    int id = Convert.ToInt32(Console.ReadLine());
    
                    //声明变量
                    bool flag = false;
                    Goods gg = null;
                    int count = 0;
    
                    //循环判断是否有这个商品
                    foreach (Goods item in goods)
                    {
                        if (item.Id == id)
                        {
                            Console.Write("输入购买数量：");
                            count = Convert.ToInt32(Console.ReadLine());
    
                            flag = true;
    
                            //保存商品
                            gg = item;
    
                            break;  //结束循环
                        }
                        else
                        {
                            flag = false;
                         
                        }
                    }//for end
    
                    if (!flag)
                    {
                        Console.WriteLine("请重新输入编号！\n");
                        continue;
                    }
    
                    // 添加购物信息到购物小票
                    str =string.Format("{0}\n{1,-8}\t{2,-4:F2}\t{3,-4}\t{4,-4:C2}",str,gg.Name,gg.Price,count,gg.Price*count);
                    // 计算购物总额
                    sum += gg.Price * count;
    
                   
                    Console.Write("输入e停止购物，输入其他任意继续购物：");
                    buy = Console.ReadLine();
                    Console.WriteLine();
    
                } while (!buy.Equals("e"));
    
    
                // 添加购物总额到购物小票
                Console.WriteLine("{0}\n\n总计：{1:C2}",str,sum);
       }
    }
    }

**3)测试类**

Shopping sh = new Shopping();
                sh.ShowGoods();
                sh.ShowMenu();

**总结：使用了类与对象，数组对象，循环，分支语句，逻辑判断，字符的格式等等知识点！**

[Center]: https://img-blog.csdn.net/20160105111811721?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[Center 1]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/30/65ef6f9f65914b49bb3294b76425c36d.png