1. using System;
2.  
3. namespace Assignment_1B
4. {
5.     public class Account
6.     {
7.         // To do - declare all class data members as properties (ID, Name and Value
8.         public int ID { get; set; }
9.         public string Name { get; set; }
10.         public double Value { get; set; } = 0.0;
11.  
12.  
13.         public virtual void Deposit(double amount)
14.         {
15.             Value += amount;
16.         }
17.         public virtual void Withdraw(double amount)
18.         {
19.              Value -= amount;
20.         }
21.     }
22.  
23.     public class SavingsAccount : Account
24.     {
25.         public double InterestRate { get; set; }
26.  
27.         public void MonthEnd()
28.         {
29.             Value += Value * InterestRate;
30.         }
31.     }
32.  
33.     public class CheckingAccount : Account
34.     {
35.         public int TransactionLimit { get; set; }
36.         public int TransactionCount { get; private set; }
37.         public double TransactionFee { get; set; }
38.         public double AccountFee { get; set; }
39.  
40.         public override void Deposit(double amount)
41.         {
42.             Value += amount;
43.         }
44.  
45.         public override void Withdraw(double amount)
46.         {
47.             Value -= amount;
48.         }
49.  
50.         private void UpdateTransectionCount()
51.         {
52.             Value = TransactionLimit - TransactionCount;
53.         }
54.  
55.         public void MonthEnd()
56.         {
57.            
58.             Value = Value - ((TransactionLimit * TransactionFee)+AccountFee);
59.         }
60.     }
61.     class Program
62.     {
63.         static void Main(string[] args)
64.         {
65.             var mySavingsAccount = new SavingsAccount { ID = 5, Name = "My Savings Account", InterestRate = 0.01 };
66.             mySavingsAccount.Deposit(100.0);
67.             mySavingsAccount.Withdraw(20.0);
68.             Console.WriteLine("Current Balance after all transections (Savings Account): " + mySavingsAccount.Value);
69.             mySavingsAccount.MonthEnd();
70.             Console.WriteLine("Balance after month end (Savings Account): " + mySavingsAccount.Value);
71.  
72.  
73.             var myCheckingAccount = new CheckingAccount { ID = 7, Name = "My Checking Account", TransactionLimit = 2, TransactionFee = 1.5, AccountFee = 5.0 };
74.             myCheckingAccount.Deposit(100.0);
75.             myCheckingAccount.Withdraw(10.0);
76.             myCheckingAccount.Withdraw(10.0);
77.             myCheckingAccount.Withdraw(10.0);
78.             myCheckingAccount.Deposit(100.0);
79.             myCheckingAccount.Withdraw(20.0);
80.             Console.WriteLine("Current Balance after all transections (Checking Account): " + myCheckingAccount.Value);
81.             myCheckingAccount.MonthEnd();
82.             Console.WriteLine("Balance after month end (Checking Account):" + myCheckingAccount.Value);
83.         }
84.     }
85.  
86. }
87.