ЛР6.3 САПР

using System;

namespace FileDetails
{
    enum AccountType
    {
        Checking,
        Deposit
    }
    class BankAccount
    {
        private long accNo;
        private decimal accBal;
        private AccountType accType;
        public void Populate(decimal balance)
        {
            accNo = NextNumber();
            accBal = balance;
            accType = AccountType.Checking;
        }
        public long Number()
        { return accNo; }
        public decimal Balance()
        { return accBal; }
        public string Type()
        { return accType.ToString(); }
        private static long nextAccNo = 123;
        private static long NextNumber()
        { return nextAccNo++; }
        public decimal Deposit(decimal amount)
        {
            accBal += amount;
            return accBal;
        }
        public bool Withdraw(decimal amount)
        {
            bool sufficientFunds = accBal >= amount;
            if (sufficientFunds)
            { accBal -= amount; }
            return sufficientFunds;
        }
    }
    class CreateAccount
    {
        static void Main()
        {
            BankAccount berts = NewBankAccount();
            Write(berts);
            TestDeposit(berts);
            Write(berts);
            TestWithdraw(berts);
            Write(berts);
            BankAccount freds = NewBankAccount();
            Write(freds);
            TestDeposit(freds);
            Write(freds);
            TestWithdraw(freds);
            Write(freds);
        }
        static BankAccount NewBankAccount()
        {
            BankAccount created = new BankAccount();
            /* Console.Write("Enter the account number   : ");
            long number = long.Parse(Console.ReadLine()); */
            // long number = BankAccount.NextNumber();
            Console.Write("Enter the account balance! : ");
            decimal balance = decimal.Parse(Console.ReadLine());
            /* created.accNo = number;
            created.accBal = balance;
            created.accType = AccountType.Checking; */
            created.Populate(balance);
            return created;
        }
        static void Write(BankAccount toWrite)
        {
            Console.WriteLine("Account number is {0}", toWrite.Number());
            Console.WriteLine("Account balance is {0}", toWrite.Balance());
            Console.WriteLine("Account type is {0}", toWrite.Type());
        }
        public static void TestDeposit(BankAccount acc)
        {
            Console.Write("Enter amount to deposit: ");
            decimal amount = decimal.Parse(Console.ReadLine());
            acc.Deposit(amount);
        }
        public static void TestWithdraw(BankAccount acc)
        {
            Console.Write("Enter amount to withdraw: ");
            decimal amount = decimal.Parse(Console.ReadLine());
            if (!acc.Withdraw(amount))
            { Console.WriteLine("Insufficient funds."); }
        }
    }
}