BIS 311 DeVry Week 5 iLab

BIS 311 DeVry Week 5 I Lab
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BIS 311 DeVry Week 5 iLab
BIS311
BIS 311 DeVry Week 5 iLab
iLAB OVERVIEW
Scenario/Summary
In this lab, you'll implement an application that performs a simple sales tax calculation. The new feature of this
application, compared to what you have done in previous iLabs, is that the values entered by the user will be checked
for validity. If the amounts entered are invalid, the application will display appropriate error messages to the user. If the
input data are valid, the application will calculate the sales tax due and the total, including tax.
Sales Tax Application Business Requirements
The user enters an order amount and a sales tax percent. The order amount must be numeric and greater than 0. The
sales tax percent must be numeric, greater than or equal to 0, and less than or equal to 0.14. If the input data are
invalid, appropriate error messages will be displayed to the user. If the input data are valid, the application will calculate
the sales tax by multiplying the order amount by the sales tax percent, and will calculate the order total, including tax,
by adding the order amount and the sales tax. The sales tax and the order total, including tax, will be displayed to the
user.
TOE Chart for Sales Tax Application
Task Object Event
Get the following inputs from the user:
Order amount
Sales tax percent
txtOrderAmount
txtTaxPercent
Perform the following processing: btnCalcTotal Click
Validate inputs
Calculate Tax = Order amount * Sales tax percent
Calculate Order total = Order amount + Tax
Display the following outputs:
Error messages (if input invalid)
lstMessages

Tax (if input valid)
Order total (if input valid)
lstMessages
lstMessages
Pseudocode for Sales Tax Application
Start button-click event handler
Declare numeric variables for
Order amount
Sales tax percent
Tax
Order total
Declare string variables for
Order amount message
Sales tax percent message
Declare Boolean variable for
Inputs valid (initialize to True)
Clear messages
Call ValidateOrderAmount function with Order amount, returning Order amount message
If Order amount message is not empty (i.e. there was an error)
Display Order amount message
Set Inputs valid to False
End If
Call ValidateSalesTaxPercent function with Sales tax percent, returning Sales tax percent message
If Sales tax percent message is not empty (i.e. there was an error)
Display Sales tax percent message
Set Inputs valid to False
End If
If Inputs valid is True
Get Order amount
Get Sales tax percent
Calculate Tax = Order amount * Sales tax percent
Calculate Order total = Order amount + Tax
Display Tax
Display Order amount
End If
Stop button-click event handler
Start ValidateOrderAmount function (Order amount)

If Order amount is not numeric
Set Order amount message to "Please enter a numeric order amount."
Else If Order amount is less than or equal to zero
Set Order amount message to "Please enter an order amount greater than zero."
Else
Set Order amount message to the empty string (no error)
End If
Return Order amount message
Stop ValidateOrderAmount
Start ValidateSalesTaxPercent (Sales tax percent)
If Sales tax percent is not numeric
Set Sales tax percent message to "Please enter a numeric sales tax percent."
Else If Sales tax percent is less than zero or greater than 0.14
Set Sales tax percent message to "Please enter a sales tax percent between 0.00 and 0.14."
Else
Set Sales tax percent message to the empty string(no error)
End If
Return Sales tax percent message
Stop ValidateSalesTaxPercent
Deliverables
Submit a Word document named Lab5YourFirstLastName.docx (where YourFirstLastName = your first and
last name; e.g., Lab5JohnSmith.docx) containing the following:
Screenshot of form showing the application running, with non-numeric entries for Order amount and Sales tax
percent, and appropriate error messages displayed.
Screenshot of form showing the application running, with out-of-range entries for Order amount and Sales tax
percent, and appropriate error messages displayed.
Screenshot of form showing the application running, with valid entries for Order amount and Sales tax percent,
and correct Tax and Order total results displayed.
Copy of code for button-click event, ValidateOrderAmount function, and ValidateSalesTaxPercent function.
Category Points % Description
Create and rename form 5 10%
Add controls to form 5 10%
Set properties for controls 5 10%
Code button-click event 5 10%
Windows form was created and renamed SalesTax.vb. Form text
property was set toLab 5 Your Name (where Your Name = your
full name).
The following controls were added to the form: Identifying labels
and text boxes for entry of order amount and sales tax percent;
button to calculate total including tax; and list box for display of
error messages and results.
Name and text properties of all controls were set appropriately,
with no typos or spelling errors.
Button-click event code was entered that corresponds to the
given pseudocode, with no syntax errors.

Code
function
ValidateOrderAmount
5 10%
Function code was entered that corresponds to the given
pseudocode, with no syntax errors.
Code ValidateSalesTaxPercent
5 10%
function
Function code was entered that corresponds to the given
pseudocode, with no syntax errors.
Application is shown running successfully with screen shots for
each of the three test cases:
Test-run application successfully 20 40%
(1) non-numeric entries for order amount and sales tax percent,
with appropriate error messages;
(2) out-of-range entries for order amount and sales tax percent,
with appropriate error messages; and
(3) valid entries for order amount and sales tax percent, with
correct tax and order total results.
Total 50 100%
Required Software
Visual Studio 2012
Access the software at.devry.edu/">https://lab.devry.edu.
Steps: all
iLAB STEPS
Step 1: Launch Visual Studio and Create Project
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(a) Log into the Citrix iLab site as you did in the previous labs. Click the Microsoft Visual Studio 2012 icon to launch
Visual Studio.
(b) Pull down the File menu and select New Project . . .
(c) In the New Project dialog, ensure that under Templates in the left column, Visual Basic is selected, and that in the
center column, Windows Form Application is selected. In the Name field at the bottom of the dialog, enter SalesTax.
Click OK.
Step 2: Rename Form and Add Controls
.equella.ecollege.com/file/dd98a67d-9ec9-4df4-8603-220cf23d1074/30/BIS311_W5_iLab.html#top">Back to Top
(a) In the Solution Explorer pane on the right side of the screen, right-click on Form1.vb, select Rename, and change
the name to SalesTax.vb. Press Enter after entering the new form name.
(b) Change the Text property of the form to Lab 5 Your Name (where Your Name = your full name), as you have done
in previous labs.
(c) Drag the following controls from the ToolBox onto the form, arrange them in a logical fashion, and set their properties
as indicated in the table below.
Control Name Property Text Property
Label Label1 Order amount:
TextBox
txtOrderAmount
Label Label2 Sales tax percent:
TextBox
txtSalesTaxPercent

Button btnCalcTotal Calculate Total Including Tax
ListBox
lstMessages
(d) Ensure that all controls are positioned and sized so that the form has a neat, professional appearance and none of
the text is cut off. Your completed form should look similar to the following.
(e) Pull down the File menu and select Save All to save your work. If a Save Project dialog appears, ensure that the
project is saved to the My DocumentsVisual Studio 2012Projects folder under your DSI number. Click Save.
Step 4: Test, Debug, and Submit
.equella.ecollege.com/file/dd98a67d-9ec9-4df4-8603-220cf23d1074/30/BIS311_W5_iLab.html#top">Back to Top
(a) Run the application by doing one of the following: click the Start button; pull down the Debug menu, and select Start
Debugging; or press the F5 key.
(b) Your form should appear. Test your application by using the following test cases. For each test case, enter the
indicated values for Order amount and Sales tax percent; click the Calculate Total Including Tax button; and check that
the messages displayed in the list box are correct. Capture a screenshot showing the results of each correct test case
and paste it into a Word document. Remember to use CTRL+ALT+PrintScreen to capture a screenshot.
Test case
Order amount Sales tax percent Messages
#
1 abc def
2 -1 0.15
3 100.00 0.10
Please enter a numeric order amount.
Please enter a numeric sales tax percent.
Please enter an order amount greater than 0.
Please enter a sales tax percent between 0 and 0.14.
The sales tax is $10.00.
The total including tax is $110.00.
As an example, the screenshot for Test Case 1 should look as follows.
(c) If your application does not work correctly, debug the application and try again. Post in the Q & A Forum or contact
your professor for assistance, if needed.
(d) When your application works correctly for all test cases, select and copy all the code for the button-click event
handler, the ValidateOrderAmount function, and the ValidateSalesTaxPercent function, and paste it into your Word
document below the three test case screenshots. Save the Word document as Lab5YourFirstLastName.docx (where
YourFirstLastName = your first and last name; e.g., JohnSmith) and submit it to the appropriate dropbox.