Question

For this week's assignment , please create an application following directions in the attached document.(windows form application)

Create a base class named Account and derived classes named SavingsAccount and CheckingAccount that inherit from class Account. Base class Account should include one private instance variable of type decimal to represent the account balance. The class should provide a constructor that receives an initial balance and uses it to initialize the instance variable with a public property. The property should validate the initial balance to ensure that it’s greater than or equal to 0.0; if not throw an exception. The class should provide two public methods. Method Credit should add an amount to the current balance. Method Debit should withdraw money from the Account and ensure that the debit amount does not exceed the Account’s balance. If it does, the balance should be left unchanged, and the method should display the message “Debit amount exceeded the account balance.” The class should also provide a get accessor in property Balance that returns the current balance. Derived class SavingsAccount should inherit the functionality of an Account, but also include a decimal instance variable indicating the interest rate (percentage) assigned to the account. SavingsAccount’s constructor should receive the initial balance, as well as an initial value for the interest rate. SavingsAccount should provide public method CalculateInterest that returns a decimal that indicates the amount of interest earned by an account. Method CalculateInterest should determine this amount by multiplying the interest rate by the account balance.[ Note : SavingsAccount should inherit methods Credit and Debit without redefining them.] Derived class CheckingAccount should inherit from base class Account and include a decimal instance variable that represents the fee charged per transaction. CheckingAccount’s constructor should receive the account’s initial balance, as well as a parameter indicating a fee amount. Class CheckingAccount should redefine methods Credit and Debit so that they subtract the fee from the account balance whenever either transaction is performed successfully. CheckingAccount’s version of these methods should invoke the base-class Account version to perform the updates to an account balance. CheckingAccount’s Debit method should charge a fee only if money is actually withdrawn (i.e., the debit amount does not exceed the account balance). [Hint: Define Account’s Debit method so that it returns a bool indicating whether money was withdrawn. Then use the return value to determine whether a fee should be charged.] After defining the classes in this hierarchy, write an app that creates objects of each class and tests their methods. Add interest to the SavingsAccount object by first invoking its CalculateInterest method, then passing the returned interest amount to the object’s Credit method.

"C#"

please screenshot of the whole code. thanks.

Answer 1

using System;

public class Account
{
private decimal balance; // private member balance

public Account(decimal balance) // constructor to set balance
{
Balance = balance;
}

public virtual void Credit(decimal amt) // add amount to the current balance
{
balance = amt+balance;
}

public virtual bool Debit(decimal amt)
{
if (amt <= balance) // if amount is lesser than the balance
{
balance = balance-amt;
return true; // widthraw sucessful
}
else
{
Console.WriteLine("Debit amount exceeded account balance"); // throwing message
return false;
}   
}

  
public decimal Balance // get and set of balance
{
get { return balance; }
set
{
if (value >= 0.0M) // appllying condition that it should be greater than 0.0
{
balance = value;
}
else
{
balance = 0.0M;
Console.WriteLine("Balance should be greater equal to 0.0 setting it to 0.0");
}
}
}
  
  
}

public class SavingsAccount : Account //derived class SavingsAccount from Base class Account

{
private decimal interestRate; //private instance interestRate
  
public SavingsAccount(decimal balance, decimal interestRate) : base(balance) //constructor of SavingsAccount with addition to the value for the base class Account
{
this.interestRate = interestRate;
}

public decimal CalculateInterest() // function to calculate the interestRate

{
return Balance * interestRate / 100m; //Balance is the getter setter value of the private instance balance of Account class
}
}

public class CheckingAccount : Account //derived class CheckingAccount from base class
{
private decimal fee; // private member fee of CheckingAccount class

public CheckingAccount(decimal balance, decimal fee) : base(balance) // constructor which sets inital value of fee and the base class value balance.
{
this.fee = fee;
}

public override void Credit(decimal amount) //overriding the function Credit for the derived class fee
{
base.Credit(amount); // call base class credit function
Balance = Balance-fee;
}

public override bool Debit(decimal amount) //overriding the function Debit for the derived class fee
{
if(base.Debit(amount))
{
Balance = Balance-fee;
return true;
}
else
{
return false;
}
}

}
class Application
{
static void Main()
{
Account obj = new Account(1050); //obj of account
Console.WriteLine("Account1: Initial Balance: {0:C}", obj.Balance);
obj.Credit(300);
obj.Debit(80);
Console.WriteLine("Account1: Final Balance: {0:C}", obj.Balance);
Console.WriteLine();
  
SavingsAccount obj3 = new SavingsAccount(100, 5);
Console.WriteLine("Account2: Initial Balance: {0:C}", obj3.Balance);
obj3.Credit(200);
obj3.Debit(40);
Console.WriteLine("Current Balance: {0:C}", obj3.Balance);
decimal interest = obj3.CalculateInterest();
obj3.Credit(interest);
Console.WriteLine("Account2: Final Balance: {0:C}", obj3.Balance);
Console.WriteLine();

CheckingAccount obj2 = new CheckingAccount(4400, 2.5M);
Console.WriteLine("Account3: Initial Balance: {0:C}", obj2.Balance);
obj2.Credit(200);
obj2.Debit(70);
Console.WriteLine("Account3: Final Balance: {0:C}", obj2.Balance);

Console.ReadKey();
}
}

Output Input Comments Account1: Initial Balance: $1,050.00 Account1: Final Balance: $1,270.00 Account2: Initial Balance: $100.00 Current Balance: $260.00 Account2: Final Balance: $273.00 Account3: Initial Balance: $4,400.00 Account3: Final Balance: $4,525.00

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