using System; public class MainClass { public static void Main(string[] strings) { SavingsAccount sa = new SavingsAccount(); sa.Withdrawal(100); CheckingAccount ca = new CheckingAccount(); ca.Withdrawal(100); } } abstract public class BankAccount { abstract public void Withdrawal(double dWithdrawal); } public class SavingsAccount : BankAccount { override public void Withdrawal(double dWithdrawal) { Console.WriteLine("Call to SavingsAccount.Withdrawal()"); } } public class CheckingAccount : BankAccount { override public void Withdrawal(double dWithdrawal) { Console.WriteLine("Call to CheckingAccount.Withdrawal()"); } }