using System;

using System.Collections.Generic;

    interface IROI

    {

           void GetRateOfInterest();

    }

    interface ITransaction

    {

        void TransferAmount();

    }

    public abstract class Account

    {

        public readonly long  Acc_num;

        public string Acc_Name;

        public int Balance;

        public static long Account_number=100200300400;

        public Account()

        {

            Account_number=Account_number+1;

            Acc_num=Account_number;

            Balance=100;

        }

        public void OpenAccount()

        {

            Console.WriteLine("Opening of a New Account");            

            Console.WriteLine("Enter the name of the account holder:");

            Acc_Name=Console.ReadLine();            

            Console.WriteLine("New Account Number : {0}",Acc_num);

            Console.WriteLine("Account Name :{0}",Acc_Name);

        }

        public void RemoveAccount()

        {

        }

        public void  EditAccount()

        {

            char choice=' ';

          Console.WriteLine("Do you wish to edit your account name: (Y/N)");  

          choice=char.Parse(Console.ReadLine());

          if(choice=='Y')

          {

          Console.WriteLine("Enter your new account name :");

          Acc_Name=Console.ReadLine();

          Console.WriteLine("Account name Updated");

          }

        }

        public void Deposit(int amt)

        {

            Balance += amt;

        }

        public void Withdrawal(int amt)

        {

            Balance -= amt;

        }

        public void Check_balance()

        {

            Console.WriteLine("Remaining balance : {0}",Balance);

        }

        public virtual void GetAccountDetails()         

        {

            SortedList<int,Savings_Account> Get= new SortedList<int,Savings_Account>();

            Console.WriteLine("New Account Number :{0}",Acc_num);

            Console.WriteLine("Account Name :{0}",Acc_Name);

            Console.WriteLine("Remaining balance :{0}",Balance);

        }

    }

    public class Savings_Account : Account, IROI , ITransaction

    {

        public int MaxAmountPerDay=20000;

        public double Interest;

        public double rate = 0.15f;

        public void GetRateOfInterest()

        {

            Interest = (Balance * rate)/100;

            Console.WriteLine("Rate of Interest : {0}",Interest);

        }

        public void TransferAmount()

        {

        }

    }

   public class Program

    {

    public static void Main()

    {

        int ch=0;

        SortedList<int,Savings_Account> SA= new SortedList<int,Savings_Account>();

        Savings_Account account1= new Savings_Account();

        Console.WriteLine("Welcome to Online Banking System");

        Console.WriteLine("1.Open New Account");

        Console.WriteLine("2.Check Balance");

        Console.WriteLine("3.Deposit Money");

        Console.WriteLine("4.Withdraw Money");

        Console.WriteLine("5.Transfer Money");

        Console.WriteLine("What you want to do ?");

        ch=int.Parse(Console.ReadLine());

        switch (ch)

        {

        case 1:        

        account1.OpenAccount();        

        SA.Add(1,account1);

        break;      

        case 2:

        account1.Check_balance();           

        break;

        case 3:

        Console.WriteLine("Enter the amount you want to deposit");  

        int amt=int.Parse(Console.ReadLine());

        account1.Deposit(amt);  

        account1.GetAccountDetails();

        break;

        }

    }

    }

​

​