I’m using VB 2008. I need to
write a simple program that calculates total sales of purchases. The program should accept item costs as input calculate the tax on each item (8%) display the item cost, total cost, and total after taxes. Item costs will be added to a listbox while the total without the taxes will be displayed in a label, the tax amount in another label, and finally, the total cost (items cost + tax) in a third label.
To write a program that calculates the total sales of purchases in VB 2008, follow these steps:
1. Create a new Windows Forms Application project in Visual Basic 2008.
2. Drag and drop the following controls from the Toolbox onto the form:
- ListBox (name it lstItems)
- Label (name it lblTotalCostWithoutTax)
- Label (name it lblTaxAmount)
- Label (name it lblTotalCostWithTax)
- TextBox (name it txtItemCost)
- Button (name it btnAddItem)
- Button (name it btnCalculate)
3. Double-click on the form to generate the Form_Load event handler and add the following code inside it:
```vb
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
lblTotalCostWithoutTax.Text = "0"
lblTaxAmount.Text = "0"
lblTotalCostWithTax.Text = "0"
End Sub
```
4. Double-click on the "Add Item" button to generate the btnAddItem_Click event handler and add the following code inside it:
```vb
Private Sub btnAddItem_Click(sender As Object, e As EventArgs) Handles btnAddItem.Click
Dim itemCost As Double
If Double.TryParse(txtItemCost.Text, itemCost) Then
lstItems.Items.Add(itemCost.ToString("F2"))
txtItemCost.Text = ""
txtItemCost.Focus()
Else
MessageBox.Show("Invalid item cost. Please enter a valid number.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
End If
End Sub
```
5. Double-click on the "Calculate" button to generate the btnCalculate_Click event handler and add the following code inside it:
```vb
Private Sub btnCalculate_Click(sender As Object, e As EventArgs) Handles btnCalculate.Click
Dim totalCostWithoutTax As Double = 0
Dim taxAmount As Double = 0
Dim totalCostWithTax As Double = 0
For Each item As String In lstItems.Items
totalCostWithoutTax += CDbl(item)
Next
taxAmount = totalCostWithoutTax * 0.08
totalCostWithTax = totalCostWithoutTax + taxAmount
lblTotalCostWithoutTax.Text = totalCostWithoutTax.ToString("F2")
lblTaxAmount.Text = taxAmount.ToString("F2")
lblTotalCostWithTax.Text = totalCostWithTax.ToString("F2")
End Sub
```
That's it! You have now created a simple program that calculates the total sales of purchases in VB 2008. When you run the program, you can enter the item costs in the textbox and click the "Add Item" button to add them to the listbox. After adding all the items, you can click the "Calculate" button to display the total cost without tax, the tax amount, and the total cost with tax in the respective labels on the form.
To write a program in VB 2008 that calculates total sales of purchases, you can follow these steps:
Step 1: Design your form
- Open VB 2008 and create a new Windows Forms Application project.
- Drag and drop the necessary controls onto the form: a Listbox for item costs, and three Labels for displaying the results.
Step 2: Set up the event handlers
- Double-click on the form to open the code window.
- At the top of the code window, declare the variables you will use:
```vb
Dim itemCosts As New List(Of Double)()
Dim totalCost As Double = 0
Dim totalTax As Double = 0
```
- Next, add the event handler for the button click event (assuming you have a button that triggers the calculations). In the event handler, add the following code:
```vb
' Get the item cost from the user (assuming you have an input textbox for this)
Dim cost As Double = Double.Parse(txtItemCost.Text)
' Calculate tax and update the labels
Dim tax As Double = cost * 0.08
totalCost += cost + tax
totalTax += tax
' Add the item cost to the listbox
lstItemCosts.Items.Add(cost)
' Update the labels
lblTotalCost.Text = totalCost.ToString("C") 'Displays the total cost in currency format
lblTotalTax.Text = totalTax.ToString("C") 'Displays the total tax in currency format
lblTotalAfterTax.Text = (totalCost - totalTax).ToString("C") 'Displays the total after tax in currency format
```
That's it! By following these steps, you'll have a program that calculates the total sales of purchases.