Wrox.ProCSharp.JupiterBank.GoldAccount.ToString C# (CSharp) Method

        public override string ToString() =>
            $"Venus Bank Saver: Balance = {_balance,6:C}";
    }

        static void Main()
        {
            IBankAccount venusAccount = new SaverAccount();
            IBankAccount jupiterAccount = new GoldAccount();

            venusAccount.PayIn(200);
            venusAccount.Withdraw(100);
            WriteLine(venusAccount.ToString());

            jupiterAccount.PayIn(500);
            jupiterAccount.Withdraw(600);
            jupiterAccount.Withdraw(100);
            WriteLine(jupiterAccount.ToString());
        }