12.13 (Polymorphic Banking Program Using Account Hierarchy) ( C#) Develop a poly
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Question
12.13 (Polymorphic Banking Program Using Account Hierarchy) ( C#)
Develop a polymorphic banking app using the Account hierarchy created in Exercise 11.8. Create an array of Account references to SavingsAccount and CheckingAccount objects. For each Account in the array, allow the user to specify an amount of money to withdraw from the Account using method Debit and an amount of money to deposit into the Account using method Credit. As you process each Account, determine its type. If an Account is a SavingsAccount, calculate the amount of interest owed to the Account using method CalculateInterest, then add the interest to the account balance using method Credit. After processing an Account, display the updated account balance obtained by using baseclass property Balance.
Explanation / Answer
using System
namespace BankApp
{
public class Application
{
static void Main(string[] args)
{
SavingAccount John_Doe = new SavingAccount(100M, 0.05M);
John_Doe.Credit( John_Doe.CalculateInterest() );
Console.WriteLine("balance after interest amount of saving account: {0}", John_Doe.Balance);
CheckingAccount Jane_Doe = new CheckingAccount(100M, 0.25M);
Jane_Doe.Credit(15.45M);
Console.WriteLine("balance after crediting checking account: {0}", Jane_Doe.Balance);
Console.WriteLine("");
Jane_Doe.Debit(15.45M);
Console.WriteLine("balance after debiting checking account: {0}", Jane_Doe.Balance);
Console.WriteLine("");
} // end Main
} // end class Application
public class Account
{
private decimal balance;
public decimal Balance
{
get { return balance; }
set
{
if (value < 0)
{
balance = 0;
Console.WriteLine("Initial balance was invalid");
}
else
balance = value;
} // end set
} // end property Balance
public Account(decimal B)
{
Balance = b;
} // end constructor Account
public virtual void Credit(decimal a)
{
balance += a;
} // end method Credit
public virtual bool Debit(decimal a)
{
if (balance < a)
{
Console.WriteLine("Debit amount exceeded account balance.");
return false;
}
else
{
balance -= a;
return true;
}
} // end method Debit
} // end class Account
public class SavingAccount : Account
{
decimal interestRate;
public SavingAccount(decimal b, decimal rate) :
base(B)
{
interestRate = rate;
} // end constructor SavingAccount
public decimal CalculateInterest()
{
return interestRate * Balance;
} // end method CalculateInterest
} // end class SavingAccount
public class CheckingAccount : Account
{
private decimal fee;
public CheckingAccount( decimal b, decimal f ) :
base( b )
{
fee = f;
} // end constructor CheckingAccont
public override void Credit(decimal a)
{
base.Credit(a); // credit account with amount a using base class's Credit method
Balance -= fee; // deduct fee
}
public override bool Debit(decimal a)
{
if (base.Debit(a) == true)
{
Balance -= fee; // deduct fee
return true;
}
else
return false;
}
} // end class CheckingAccount
} // end namespace BankApp
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