1、 對象數組的使用 題目要求：實現超市購物結算并輸出購物小票功能。首先顯示所有商品信息，然后輸入購物的商品編號和數量進行購物結算，最后輸出購物小票。程序運行結果如圖4.12所示。要求如下：商品單價顯示為兩位小數，商品的小計和總計顯示為貨幣形式，保留兩位小數購物小票的四列均為左對齊，商品名稱列寬度為8，后三列寬度為4參考代碼：商品類： / <summary> / 商品類 / </summary> class Goods int _id; / <summary> / 商品編號 / </summary> public int Id get return

2、_id; set _id = value; string _name; / <summary> / 商品名稱 / </summary> public string Name get return _name; set _name = value; double _price; / <summary> / 商品價格 / </summary> public double Price get return _price; set _price = value; 購物類： / <summary> / 購物類 / </summary>

3、; class Shopping string _list; Goods goodsList; / <summary> / 初始化商品信息 / </summary> private void Initial() this.goodsList = new Goods3; this.goodsList0 = new Goods(); this.goodsList0.Name = "農夫山泉" this.goodsList0.Price = 1.025; this.goodsList1 = new Goods(); this.goodsList1.Name

4、 = "今麥郎碗面" this.goodsList1.Price = 3.5; this.goodsList2 = new Goods(); this.goodsList2.Name = "雙匯火腿腸" this.goodsList2.Price = 12.6; / <summary> / 顯示商品信息 / </summary> private void ShowGoodsInfo() Console.WriteLine("0,-4t1,-8t2:0.00","編號","商品名稱&

5、quot;,"單價"); for (int i = 0; i < this.goodsList.Length; i+) Console.WriteLine("0,-4t1,-8t2:0.00", i + 1, this.goodsListi.Name, this.goodsListi.Price); / <summary> / 打印購物小票 / </summary> public void PrintList() this.Initial(); / 初始化商品信息 this.ShowGoodsInfo(); / 顯示商品信息

6、 double sum = 0; / 購物金額 this._list = "nn-歡迎光臨光輝超市-" this._list = string.Format("0n1,-8t2,-4:F2t3,-4t4,-4:F2", this._list, "商品名稱", "單價", "數量", "小計"); do Console.Write("n輸入商品編號："); int num = int.Parse(Console.ReadLine(); if (num >

7、; 3 | num < 1) Console.WriteLine("請重新選擇商品編號！"); continue; Console.Write("輸入購買數量："); int amount = int.Parse(Console.ReadLine(); / 添加購物信息到購物小票 this._list = string.Format("0n1,-8t2,-4:F2t3,-4t4,-4:C2", this._list, this.goodsListnum - 1.Name, this.goodsListnum - 1.Price, amount, this.goodsListnum - 1.Price * amount); / 計算購物總額 sum += this.goodsListnum - 1.Price * amount; Console.Write("輸入e停止購物，輸入其他任意鍵繼續購物："); if (Console.ReadLine() = "e") break; while (true); / 添加購物總額到購物小票 this._list = string.Format(&qu