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.
- 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 discounts 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.
- Planning the Form
- 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 |
| | |
- 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 |
| |