visual basic 2010 question

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CSC139 Chapter 9 Lab Assignments (1)

 

 

 

 

 

Classes and Objects

 

 

 

 

 

Objectives

 

 

 

In this lab assignment, students will learn:

 

 

 

- How to design and define class

 

 

 

- How to create object

 

 

 

- How to define a tester program to test the object

 

 

 

Goals

 

 

 

In this lab assignment, students will demonstrate the abilities to:

 

 

 

- Design and define class

 

 

 

- Create object

 

 

 

- Define a tester program to test the object

 

 

 

Grading

 

 

 

- Design and create a GUI (20 pts)

 

 

 

- Design and define class (40 pts)

 

 

 

- Define tester program (40 pts)

 

 

 

 

Develop a "BankAccount" windows form project, which will allow user to

 

 

 

 

 

 

- Enter amount of money to deposit, withdraw or move

 

 

 

- Deposit money in checking or savings account.

 

 

 

- Withdraw money from checking or savings account.

 

 

 

- Move money between checking account and saving account.

 

 

 

- View the new balance on the form after each transaction.

 

 

 

Here is sample input/output:

 

 

 

When start to run project, initial balances for both checking and saving accounts ($1000.00) should be displayed on the form.

 

 

 

After deposit $500.00 to checking account.

 

 

 

After move $800.00 from saving to checking account.

 

 

 

If user attempts to withdraw $4000.00 from checking account at this moment, a MessageBox should be displayed with an error message.

 

 

 

 

 

Project specifications --------

 

 

 

 

1. This project should perform object-oriented programming. Add a class file "Account.vb" to define class "Account", rename "Form1.vb" file as "AccountTesterForm.vb" which will create account object and test the object’s attributes and behaviors.

 

 

 

 

 

 

 

 

 

 

 

2. This is the GUI for the bank. The amount of money need to be entered from the textbox, each button represents a type of transaction. The new balance will be displayed on the form after each transaction. Please use the same control names in order to use the tester program code below.

 

 

 

 

 

 

balanceLabel

 

 

 

amountTextBox

 

 

 

moveStoCButton

 

 

 

withdrawSavingButton

 

 

 

depositSavingButton

 

 

 

moveCtoSButton

 

 

 

depositCheckingButton

 

 

 

withdrawCheckingButton

 

 

 

 

3. Here is the definition of class Account, some codes are missing, you may copy the code to your project in Visual Studio and complete the missing code.

 

 

 

 

 

 

Public Class Account

 

 

 

 

 

Private savingBalance As Decimal 'instance variable for balance in saving account

 

 

 

Private checkingBalance As Decimal 'instance variable for balance in checking account

 

 

 

'constructor which initialize balances in both accounts to 1000.00

 

 

 

Public Sub New()

 

 

 

savingBalance = 1000.0

 

 

 

checkingBalance = 1000.0

 

 

 

End Sub

 

 

 

'property for savingBalance

 

 

 

Public Property Saving() As Double

 

 

 

Get

 

 

 

Return savingBalance

 

 

 

End Get

 

 

 

Set(ByVal value As Double)

 

 

 

If value < 0 Then

 

 

 

savingBalance = 0

 

 

 

Else

 

 

 

savingBalance = value

 

 

 

End If

 

 

 

End Set

 

 

 

End Property

 

 

 

'property for checkingBalance

 

 

 

Public Property Checking() As Double

 

 

 

'write your code here

 

 

 

End Property

 

 

 

'define how to deposit money to checking account

 

 

 

Public Sub depositChecking(ByVal amount As Decimal)

 

 

 

'write your code here

 

 

 

End Sub

 

 

 

'define how to deposit money to saving account

 

 

 

Public Sub depositSaving(ByVal amount As Decimal)

 

 

 

'write your code here

 

 

 

End Sub

 

 

 

'define how to withdraw money from checking account

 

 

 

Public Sub withdrawChecking(ByVal amount As Decimal)

 

 

 

If amount > Checking Then

 

 

 

Throw New ArgumentOutOfRangeException(

 

 

 

"Withdrawal amount must be less than or equal to balance.")

 

 

 

ElseIf amount <= 0D Then

 

 

 

Throw New ArgumentOutOfRangeException(

 

 

 

"Withrawal amount must be positive.")

 

 

 

End If

 

 

 

Checking -= amount

 

 

 

End Sub

 

 

 

'define how to withdraw money from saving account

 

 

 

Public Sub withdrawSaving(ByVal amount As Decimal)

 

 

 

'write your code here

 

 

 

End Sub

 

 

 

'define how to move money from checking to saving account

 

 

 

Public Sub moveMoneyCheckingtoSaving(ByVal amount As Double)

 

 

 

'write your code here

 

 

 

End Sub

 

 

 

'define how to move money from saving to checking account

 

 

 

Public Sub moveMoneySavingtoChecking(ByVal amount As Double)

 

 

 

'write your code here

 

 

 

End Sub

 

 

 

 

 

End Class

 

 

 

 

4. Here is the code for accountTesterForm.vb, some codes are missing, you may copy the code to your project in Visual Studio and complete the missing code (The header of event handler methods can NOT be copied, they need to be created by double clicking the corresponding buttons).

 

 

 

 

 

 

Option Strict On

 

 

 

Public Class AccountTesterForm

 

 

 

Dim account As New Account()

 

 

 

Private Sub AccountTesterForm_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

 

 

 

displayBalance()

 

 

 

End Sub

 

 

 

Private Sub DepositCheckingButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles DepositCheckingButton.Click

 

 

 

Try

 

 

 

account.depositChecking(Convert.ToDecimal(AmountTextBox.Text))

 

 

 

displayBalance()

 

 

 

Catch ex As ArgumentOutOfRangeException

 

 

 

MessageBox.Show("Deposit amount must be positive.",

 

 

 

"Error", MessageBoxButtons.OK, MessageBoxIcon.Error)

 

 

 

End Try

 

 

 

AmountTextBox.Clear() ' clear the inputTextBox

 

 

 

AmountTextBox.Focus()

 

 

 

End Sub

 

 

 

Private Sub DepositSavingButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles DepositSavingButton.Click

 

 

 

 

 

'write your code here

 

 

 

 

 

End Sub

 

 

 

Private Sub withdrawCheckingButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles withdrawCheckingButton.Click

 

 

 

 

 

'write your code here

 

 

 

 

 

End Sub

 

 

 

Private Sub withdrawSavingButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles withdrawSavingButton.Click

 

 

 

 

 

'write your code here

 

 

 

 

 

End Sub

 

 

 

Private Sub movectosButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles movectosButton.Click

 

 

 

 

 

'write your code here

 

 

 

 

 

End Sub

 

 

 

Private Sub moveStoCButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles moveStoCButton.Click

 

 

 

 

 

'write your code here

 

 

 

 

 

End Sub

 

 

 

Private Sub displayBalance()

 

 

 

balanceLabel.Text = "Checking balance: " & String.Format("{0:C}", account.Checking) & vbCrLf & "Saving balance: " & String.Format("{0:C}", account.Saving)

 

 

 

End Sub

 

 

 

End Class

 

 

 

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