using System;

//BankAccount class

public class BankAccount

{

    //1. [Code] Create properties (use auto-implementation)

    //(a) OwnerName: public, string

    public string OwnerName {get;set;}

    //(b) Balance: public, double

    public double Balance {get; set;}

    //(c) AccountID: protected, string

    protected string AccountID {get; set;}

    //(d) OpeningYear: private, int

    private int OpeningYear {get; set;}

    //Default constructor

    public BankAccount() { }

    //2. [Code] Create the second constructor with 4 parameters to set up those 4 properties (OwnerName, Balance, AccountID, and OpeningYear)

    public BankAccount (string o, double b, string a, int y)

    {

        OwnerName = o;

        Balance = b;

        AccountID = a;

        OpeningYear = y;

    }

    //3. [Code] Create function: PrintOwnerName

    //input: no

    //ouput: no

    //behaviors: print out owner's name

    public void PrintOwnerName()

    {

        Console.WriteLine(OwnerName);

    }

    //4. [Code] Create function: ShowBalance

    //input: no

    //ouput: no

    //behaviors: print out balance

    //Note: add keyword "virtual" to allow overrider later

    public virtual void ShowBalance() 

    {

        Console.WriteLine(Balance);

    }

}

​

//CheckingAccount class

public class CheckingAccount : BankAccount

{

    //Properties

    public int WithdrawLimit {get; set;}

    //Default construtor

    public CheckingAccount() { }

    //5. [Code] Create the second constructor with 5 parameters

    //(a) use keyword "base" to call parent's construtor (hint: need to pass 4 parameters to parent by using base())

    //(b) set up WithdrawLimit

    public CheckingAccount(string o, double b, string a, int y, int w): base(o, b, a, y)

    {

        WithdrawLimit = w;

    }

    //6. [Code] Create function: PrintOwnerName

    //input: no

    //ouput: no

    //behaviors: Console.WriteLine("CheckingAccount OwnerName: "+ OwnerName);

    //Use Method Hiding Technique

    public new void PrintOwnerName()

    {

        Console.WriteLine("CheckingAccount OwnerName: "+OwnerName);

    }

    //7. [Code] Create function: ShowBalance

    //input: no

    //ouput: no

    //behaviors: Console.WriteLine("CheckingAccount Balance: "+ Balance);

    //Use Method Overriding Technique

    public override void ShowBalance()

    {

        Console.WriteLine("CheckingAccount Balance: "+ Balance);

    }

    public void Function()

    {   

        //8. Question

        //Can you print out AccountID (yes or no)? Why or why not?

        //Console.WriteLine(AccountID);

        //yes because a protected property can be accessed by the child class

        //Can you print out OpeningYear (yes or no)? Why or why not?

        //Console.WriteLine(OpeningYear);

        //no because a private property is only accesible by the parent class

    }

}

​

public class Program

{

    public static void Main()

    {

        //9. Question

        //Unmark the following code once you finish both BankAccount and CheckingAccount classes

        //Answer the following two questions

        CheckingAccount ca = new CheckingAccount("Mary", 5000, "A12345", 2012, 6);

        ca.PrintOwnerName();

        //What is this technique? (a) method hiding, (b) method overriding

        //(a) method hiding

        Console.WriteLine("======================");

        BankAccount ba = new CheckingAccount("John", 3000, "B6789", 2018, 6); //Polymorphism

        ba.ShowBalance();

        //What is this technique? (a) method hiding, (b) method overriding

        //(a) method overrriding

    }

}