1. 程式人生 > >C#銀行ATM程式--練習

C#銀行ATM程式--練習

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using System;

namespace Bank_ATM
{
    class Account
    {
        //Constructor
        Account() { }
        Account(long bank_cardID, string password)
        {
            this.bank_cardID = bank_cardID;
            this.account_password = password;
        }

        //fields
        private static long initial_ID = 1000000001;       //the 1st one to create an account get this ID number
        private static string bank_name = "ICBC";
        private long bank_cardID;
        public string account_password;
        private long total_amount = 100000;       //initial account
        private string[] data = new string[5];
        private string[] keys =
        {
            "card ID","holder's name", "total sum", "latest withdraw","latest deposit"
        };

        //property
        public long latest_withdraw { set; get; }
        public long latest_deposit { set; get; }
        public string date_withdraw { set; get; }
        public string date_deposit { set; get; }
        public string date_create { set; get; }

        //indexer
        public string this[int i]
        {
            set
            {
                data[i] = value;
            }
            get
            {
                if (i >= 0 && i < data.Length)
                    return data[i];
                return null;
            }
        }
        public string this[string key]
        {
            get
            {
                return this[FindIndex(key)];
            }
        }
        private int FindIndex(string key)
        {
            for (int i = 0; i < keys.Length; i++)
                if (keys[i] == key)
                    return i;
            return -1;
        }

        //methods
        //withdraw from the account, record the current time
        public void withdrawMoney()
        {
            Console.Write("amount(withdraw): ");
            latest_withdraw = Convert.ToInt32(Console.ReadLine());
            if (latest_withdraw <= total_amount)
            {
                total_amount -= latest_withdraw;
                this[2] = Convert.ToString(total_amount); 
                date_withdraw = DateTime.Now.ToString();
                this[3] = Convert.ToString(latest_withdraw);
            }
            else
                Console.WriteLine("Lack of balance. Operation is refused\n");
        }

        //deposit from the account, record the current time
        public void depositMoney()
        {
            Console.Write("amount(deposit): ");
            latest_deposit = Convert.ToInt32(Console.ReadLine());
            if (latest_deposit > 0)
            {
                total_amount += latest_deposit;
                this[2] = Convert.ToString(total_amount);
                date_deposit = DateTime.Now.ToString();
                this[4] = Convert.ToString(latest_deposit);
            }
            else
                Console.WriteLine("Invalid operation\n");
        }

        //get information about the account 
        void get_card_info()              //try 4 choices below
        {
            Console.WriteLine("( card ID / holder's name / total sum / latest withdraw / latest deposit )?");
            string instr = Console.ReadLine();
            if (instr == "card ID" || instr == "holder's name" || instr == "total sum" || instr == "latest withdraw"
                || instr == "latest deposit")
            {
                this[2] = Convert.ToString(total_amount);
                Console.Write(instr + " is " + this[instr]);
                if (instr == "latest withdraw")
                    Console.WriteLine("         " + date_withdraw);
                else if (instr == "latest deposit")
                    Console.WriteLine("         " + date_deposit);
                else if (instr == "card ID")
                    Console.WriteLine("         " + date_create);
                else if (instr == "card ID" || instr == "total sum")
                    Console.WriteLine("\n");
            }
            else
                Console.WriteLine("Invalid input!!");
        }

        //Inheritance, subclass CreditAccount
        protected class CreditAccount : Account
        {
            //Constructor
            CreditAccount(long bank_cardID, string password)
            {
                this.bank_cardID = bank_cardID;
                this.account_password = password;
            }
            //new field
            private long line_of_credit;        //line of credit 

            //new property
            public string credit_rating { set; get; }

            //new method
            public long get_line_of_credit()        //line of credit according to the credit rating
            {
                if (credit_rating == "3" || credit_rating == "2")
                    line_of_credit = 50000;
                else if (credit_rating == "1" || credit_rating == "0")
                    line_of_credit = 10000;
                else
                    line_of_credit = 0;
                return line_of_credit;
            }

            //override method withdrawMoney()
            new public void withdrawMoney()
            {
                Console.Write("amount(withdraw): ");
                latest_withdraw = Convert.ToInt32(Console.ReadLine());
                if (latest_withdraw <= total_amount + line_of_credit)
                {
                    total_amount -= latest_withdraw;
                    this[2] = Convert.ToString(total_amount);
                    date_withdraw = DateTime.Now.ToString();
                    this[3] = Convert.ToString(latest_withdraw);
                    if (latest_withdraw >= total_amount)
                    {
                        Console.WriteLine("warning: you're using your credit!!   Withdraw successfully");
                        int temp = Convert.ToInt32(credit_rating);
                        credit_rating = Convert.ToString(--temp);
                        get_line_of_credit();
                    }
                }
                else
                {
                    Console.WriteLine("Lack of balance. Operation is refused\n");
                }
            }

            public static void Main(String[] args)
            {
                Account a;
                CreditAccount ca;
                string card_category;

                //create a new account, set password, get an ID number
                void create_account()
                {
                    Console.WriteLine("#########  " + bank_name + "  #########");      //which bank
                    Console.Write("create an account ( normal / credit )?");
                    card_category = Console.ReadLine();
                    if (card_category != "credit" && card_category != "normal")
                    {
                        Console.WriteLine("Invalid input");
                        create_account();
                    }

                    Console.Write("set password:  ");
                    string password = Console.ReadLine();                                      //set password

                    Account a_create = new CreditAccount(initial_ID, password);
                    a = a_create;
                    ca = (CreditAccount)a;

                    a[0] = Convert.ToString(initial_ID);                                 //save ID
                    Console.Write("Your name:  ");
                    a[1] = Console.ReadLine();                                      //save owner's name
                    a[2] = Convert.ToString(a.total_amount);
                    a.date_create = DateTime.Now.ToString();          //save the time that this account was created
                    Console.WriteLine("create successfully!!\nYour ID: " + initial_ID + "    " +
                        "Remember your password:" + password + "    You have $100000 initially.");
                    initial_ID++;
                    a.latest_deposit = 0;
                    a.latest_withdraw = 0;

                    if (card_category == "credit")
                    {
                        ca.credit_rating = "3";
                        ca.get_line_of_credit();
                    }
                   
                }

                create_account();

                while (true)
                {
                    if (card_category == "normal")
                    {
                        //ask for the next instruction from the user
                        Console.WriteLine("( create again / get information / withdraw / deposit )?");
                        switch (Console.ReadLine())
                        {
                            case "create again": create_account(); break;
                            case "get information":
                                a.get_card_info(); break;
                            case "withdraw":
                                a.withdrawMoney();
                                a[2] = Convert.ToString(a.latest_withdraw);
                                break;
                            case "deposit":
                                a.depositMoney();
                                a[3] = Convert.ToString(a.latest_deposit);
                                break;
                            default:
                                Console.WriteLine("invalid input\n");
                                break;
                        }

                    }
                    else if (card_category == "credit")
                    {
                        //ask for the next instruction from the user
                        Console.WriteLine("( create again / get information / withdraw / deposit / line of credit )?");
                        switch (Console.ReadLine())
                        {
                            case "create again": create_account(); break;
                            case "get information":
                                ca.get_card_info(); break;
                            case "withdraw":
                                ca.withdrawMoney();
                                ca[2] = Convert.ToString(ca.latest_withdraw);
                                break;
                            case "deposit":
                                ca.depositMoney();
                                ca[3] = Convert.ToString(ca.latest_deposit);
                                break;
                            case "line of credit":
                                Console.WriteLine("LIne of credit:  " + ca.get_line_of_credit());
                                break;
                            default:
                                Console.WriteLine("invalid input\n");
                                break;
                        }
                    }
                }
            }
        }
    }
}