Lab #2 - Book Sale Calculator

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• Be sure to include comments at the top of each procedure and at the top of the file.
• Be sure to use meaningful names for all buttons and labels.

1. In this project, R 'n R Refreshment needs to expand the book sale project done previously. In addition to calculating individual sales and discounts, management wants to know the total number of books sold, the total number of discoutns given, the total discounted amount, and the average discount per sale. Add error handling to the program, so that missing or nonnumeric data will not cause a run-time error.
2. Planning the Form
3. Planning Objects and Properties

   Object	Property	Setting
   Main Form	Name	BookSaleForm
   	Text	R 'n R - For Reading and Refreshment
   	StartPosition	CenterScreen
   	AcceptButton	CalculateButton
   	CancelButton	ClearButton
   Label1	Text	Book Sales
   	Font	Bold, 12 point
   GroupBox1	Text	blank
   Label2	Text	&Quantity
   QuantityTextBox	Name	QuantityTextBox
   	Text	blank
   Label3	Text	&Title
   TitleTextBox	Name	TitleTextBox
   	Text	blank
   Label4	Text	&Price
   PriceTextBox	Name	PriceTextBox
   	Text	blank
   GroupBox2	Name	GroupBox2
   	Text	blank
   Label5	Text	Extended Price
   ExtendedPriceTextBox	Name	ExtendedPriceTextBox
   	Text	blank
   	ReadOnly	true
   	TextAlign	Right
   Label6	Text	15% Discount
   DiscountTextBox	Name	DiscountTextBox
   	Text	blank
   	ReadOnly	true
   	TextAlign	Right
   Label7	Text	Discounted Price
   DiscountedPriceTextBox	Name	DiscountedPriceTextBox
   	Text	blank
   	TextAlign	Right
   	ReadOnly	true
   Calculate Button	Name	CalculateButton
   	Text	&Calculate
   ClearButton	Name	ClearButton
   	Text	Clear &Sale
   ExitButton	Name	ExitButton
   	Text	E&xit
   GroupBox3	Name	GroupBox3
   	Text	Summary
   Label8	Text	Total Number of Books
   QuantitySumTextBox	Name	QuantitySumTextBox
   	Text	blank
   	ReadOnly	true
   	TextAlign	Right
   Label9	Text	Total Discounts Given
   DiscountSumTextBox	Name	DiscountSumTextBox
   	Text	blank
   	ReadOnly	True
   	TextAlign	Right
   Label10	Text	Total Discounted Amounts
   DiscountedAmountSumTextBox	Name	DiscountedAmountSumTextBox
   	Text	blank
   	ReadOnly	true
   	TextAlign	Right
   Label11	Text	AverageDiscount
   AverageDiscountTextBox	Name	AverageDiscountTextBox
   	Text	blank
   	ReadOnly	true
   	TextAlign	Right

4. Planning Event Procedures

   Procedure	Actions - Pseudocode
   ExitButton_Click	End the project
   ClearButton_Click	Clear each text box except Summary fields
   	Set the focus in the first text box
   CalculateButton_Click	Declare the variables
   	Try Convert the input Quantity to number. Try Convert the input Price to numeric Calculate Extended Price = Quantity * Price Calculate Discount = Extended Price * Discount Rate Calculate Discounted Price = Extended Price - Discount Calculate the summary values: Add Quantity to Quantity Sum Add Discount to Discount Sum Add Discounted Price to Discounted Price Sum Add 1 to Sale Count Calculate Average Discount = Discount Sum / Sale Count Format and display sale output Format and display summary values Catch any Price exception Display error message and reset the focus to Price Catch any Quantity Exception Display error message and reset the focus to Quantity Catch any generic exception Display error message