系統開發-初始化撲克牌

21點遊戲中需要撲克牌，四種花色，每種花色1-13張，分別為1,2,3,4,5,6,7,8,9,10,J,Q,K，共52張。
我們先將一張撲克牌定義為Card物件，並定義其屬性為花色和點數。

class Card
{
    public string Suit { get; set; }
    public int Rank { get; set; }

    // Card建構函數
    public Card(string suit, int rank)
    {
        Suit = suit;    //花色
        Rank = rank;    //點數
    }

    // 覆寫ToString()方法來顯示撲克牌訊息
    public override string ToString()
    {
        string suitName = "";

        switch(Suit)
        {
            case "S":
                suitName = "黑桃";
                break;
            case "H":
                suitName = "紅心";
                break;
            case "D":
                suitName = "方塊";
                break;
            case "C":
                suitName = "梅花";
                break;
        }

        return $"{suitName}{Rank}";
    }
}

再建立一副牌共52張，並設定其花色與點數，再顯示到畫面上，以下為完整程式碼
default.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <asp:Label ID="Label1" runat="server" Text=""></asp:Label>
        </div>
    </form>
</body>
</html>

default.aspx.cs

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string[] suits = { "S" , "H" , "D" , "C"};  //"S黑桃" , "H紅心" , "D方塊" , "C梅花"

        Card[] cards = new Card[52];    //一副牌52張
        int index = 0;

        for(int i=0; i<suits.Length; i++)   //四種花色
        {
            for(int j=1; j<=13; j++)    //一種花色13張牌1-13
            {
                cards[index] = new Card(suits[i], j);
                index++;
            }
        }

        for(int i=0; i<cards.Length; i++)
        {
            if(i%13 == 0)   //13張牌排成一行
            {
                Label1.Text += $"<br>{cards[i].ToString()}"; //換行
            }
            else
            {
                //Label1.Text += $"，{cards[i].ToString()}";             //Card class預設顯示方式
                Label1.Text += $"，{cards[i].Suit}{cards[i].Rank}";      //自訂顯示方式
            }
        }
    }
}

class Card
{
    public string Suit { get; set; }
    public int Rank { get; set; }

    // Card建構函數
    public Card(string suit, int rank)
    {
        Suit = suit;    //花色
        Rank = rank;    //點數
    }

    // 覆寫ToString()方法來顯示撲克牌訊息
    public override string ToString()
    {
        string suitName = "";

        switch(Suit)
        {
            case "S":
                suitName = "黑桃";
                break;
            case "H":
                suitName = "紅心";
                break;
            case "D":
                suitName = "方塊";
                break;
            case "C":
                suitName = "梅花";
                break;
        }

        return $"{suitName}{Rank}";
    }
}

執行結果