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Bank Account class is abstract since there is no single implementation for Withdrawal

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()");     } }