Answer to Question #255661 in Visual Basic for Kamo

Question

The system should allow the customer to check the price of the item(s)(list box or not) and select the items they want to buy. perform the transaction and the system should allow the end-user to enter the amount they are paying for the item(s) and get their change back. Produce a receipt of the total cost of items and change given. There are 10 items to choose from.say they chose all ten items, the total of all that and change is shown The receipt also shows the VAT(15%) of the items 10% is given to loyal customers as a discount.so it is the total amount of items that get the 10% off and the VAT for all the items. please help me.

Answer 1

Public Class frmMain
    Private amount As Double
    Private total As Double
    Private Sub btnCalculate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalculate.Click, btnCalculateChange.Click
        Dim prices() As Double = {5, 10, 7, 15, 5, 10, 7, 15, 7, 15}


        If lstItems.SelectedIndex <> -1 Then
            Dim number As Integer
            Integer.TryParse(txtNumber.Text, number)
            Double.TryParse(txtAmount.Text, amount)
            Dim subTotal As Double = number * prices(lstItems.SelectedIndex)
            Dim VAT As Double = subTotal * 0.15
            Dim discount As Double = (subTotal + VAT) * 0.1
            total = subTotal + VAT - discount
            txtVAT.Text = VAT.ToString("N2")
            txtDiscount.Text = discount.ToString("N2")
            txtTotal.Text = total.ToString("N2")
            btnCalculateChange.Enabled = True
           
        End If
    End Sub


    Private Sub btnCalculateChange_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalculateChange.Click


        Double.TryParse(txtAmount.Text, amount)
        Dim change As Double = amount - total
        txtChange.Text = change.ToString("N2")
    End Sub
End Class

<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Class frmMain
    Inherits System.Windows.Forms.Form

    'Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overrides Sub Dispose(ByVal disposing As Boolean)
        Try
            If disposing AndAlso components IsNot Nothing Then
                components.Dispose()
            End If
        Finally
            MyBase.Dispose(disposing)
        End Try
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.lstItems = New System.Windows.Forms.ListBox()
        Me.btnCalculate = New System.Windows.Forms.Button()
        Me.Label1 = New System.Windows.Forms.Label()
        Me.txtNumber = New System.Windows.Forms.TextBox()
        Me.Label2 = New System.Windows.Forms.Label()
        Me.txtVAT = New System.Windows.Forms.TextBox()
        Me.Label3 = New System.Windows.Forms.Label()
        Me.txtDiscount = New System.Windows.Forms.TextBox()
        Me.Label4 = New System.Windows.Forms.Label()
        Me.txtAmount = New System.Windows.Forms.TextBox()
        Me.Label5 = New System.Windows.Forms.Label()
        Me.txtTotal = New System.Windows.Forms.TextBox()
        Me.Label6 = New System.Windows.Forms.Label()
        Me.txtChange = New System.Windows.Forms.TextBox()
        Me.btnCalculateChange = New System.Windows.Forms.Button()
        Me.SuspendLayout()
        '
        'lstItems
        '
        Me.lstItems.FormattingEnabled = True
        Me.lstItems.Items.AddRange(New Object() {"Item 1  - price 5 ", "Item 2  - price 10", "Item 3  - price 7", "Item 4  - price 15", "Item 5  - price 5 ", "Item 6  - price 10", "Item 7  - price 7", "Item 8  - price 15", "Item 9  - price 7", "Item 10  - price 15"})
        Me.lstItems.Location = New System.Drawing.Point(12, 12)
        Me.lstItems.Name = "lstItems"
        Me.lstItems.Size = New System.Drawing.Size(101, 186)
        Me.lstItems.TabIndex = 0
        '
        'btnCalculate
        '
        Me.btnCalculate.Location = New System.Drawing.Point(131, 175)
        Me.btnCalculate.Name = "btnCalculate"
        Me.btnCalculate.Size = New System.Drawing.Size(75, 23)
        Me.btnCalculate.TabIndex = 1
        Me.btnCalculate.Text = "Calculate"
        Me.btnCalculate.UseVisualStyleBackColor = True
        '
        'Label1
        '
        Me.Label1.AutoSize = True
        Me.Label1.Location = New System.Drawing.Point(136, 22)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(73, 13)
        Me.Label1.TabIndex = 2
        Me.Label1.Text = "Enter number:"
        '
        'txtNumber
        '
        Me.txtNumber.Location = New System.Drawing.Point(215, 19)
        Me.txtNumber.Name = "txtNumber"
        Me.txtNumber.Size = New System.Drawing.Size(100, 20)
        Me.txtNumber.TabIndex = 3
        '
        'Label2
        '
        Me.Label2.AutoSize = True
        Me.Label2.Location = New System.Drawing.Point(155, 48)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(60, 13)
        Me.Label2.TabIndex = 2
        Me.Label2.Text = "VAT (15%):"
        '
        'txtVAT
        '
        Me.txtVAT.Location = New System.Drawing.Point(215, 45)
        Me.txtVAT.Name = "txtVAT"
        Me.txtVAT.ReadOnly = True
        Me.txtVAT.Size = New System.Drawing.Size(100, 20)
        Me.txtVAT.TabIndex = 3
        '
        'Label3
        '
        Me.Label3.AutoSize = True
        Me.Label3.Location = New System.Drawing.Point(128, 74)
        Me.Label3.Name = "Label3"
        Me.Label3.Size = New System.Drawing.Size(81, 13)
        Me.Label3.TabIndex = 2
        Me.Label3.Text = "Discount (10%):"
        '
        'txtDiscount
        '
        Me.txtDiscount.Location = New System.Drawing.Point(215, 71)
        Me.txtDiscount.Name = "txtDiscount"
        Me.txtDiscount.ReadOnly = True
        Me.txtDiscount.Size = New System.Drawing.Size(100, 20)
        Me.txtDiscount.TabIndex = 3
        '
        'Label4
        '
        Me.Label4.AutoSize = True
        Me.Label4.Location = New System.Drawing.Point(136, 126)
        Me.Label4.Name = "Label4"
        Me.Label4.Size = New System.Drawing.Size(73, 13)
        Me.Label4.TabIndex = 2
        Me.Label4.Text = "Enter amount:"
        '
        'txtAmount
        '
        Me.txtAmount.Location = New System.Drawing.Point(215, 123)
        Me.txtAmount.Name = "txtAmount"
        Me.txtAmount.Size = New System.Drawing.Size(100, 20)
        Me.txtAmount.TabIndex = 3
        '
        'Label5
        '
        Me.Label5.AutoSize = True
        Me.Label5.Location = New System.Drawing.Point(175, 100)
        Me.Label5.Name = "Label5"
        Me.Label5.Size = New System.Drawing.Size(34, 13)
        Me.Label5.TabIndex = 2
        Me.Label5.Text = "Total:"
        '
        'txtTotal
        '
        Me.txtTotal.Location = New System.Drawing.Point(215, 97)
        Me.txtTotal.Name = "txtTotal"
        Me.txtTotal.ReadOnly = True
        Me.txtTotal.Size = New System.Drawing.Size(100, 20)
        Me.txtTotal.TabIndex = 3
        '
        'Label6
        '
        Me.Label6.AutoSize = True
        Me.Label6.Location = New System.Drawing.Point(162, 152)
        Me.Label6.Name = "Label6"
        Me.Label6.Size = New System.Drawing.Size(47, 13)
        Me.Label6.TabIndex = 2
        Me.Label6.Text = "Change:"
        '
        'txtChange
        '
        Me.txtChange.Location = New System.Drawing.Point(215, 149)
        Me.txtChange.Name = "txtChange"
        Me.txtChange.ReadOnly = True
        Me.txtChange.Size = New System.Drawing.Size(100, 20)
        Me.txtChange.TabIndex = 3
        '
        'btnCalculateChange
        '
        Me.btnCalculateChange.Enabled = False
        Me.btnCalculateChange.Location = New System.Drawing.Point(215, 175)
        Me.btnCalculateChange.Name = "btnCalculateChange"
        Me.btnCalculateChange.Size = New System.Drawing.Size(100, 23)
        Me.btnCalculateChange.TabIndex = 1
        Me.btnCalculateChange.Text = "Calculate change"
        Me.btnCalculateChange.UseVisualStyleBackColor = True
        '
        'frmMain
        '
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(342, 225)
        Me.Controls.Add(Me.txtChange)
        Me.Controls.Add(Me.Label6)
        Me.Controls.Add(Me.txtTotal)
        Me.Controls.Add(Me.Label5)
        Me.Controls.Add(Me.txtDiscount)
        Me.Controls.Add(Me.Label3)
        Me.Controls.Add(Me.txtVAT)
        Me.Controls.Add(Me.Label2)
        Me.Controls.Add(Me.txtAmount)
        Me.Controls.Add(Me.Label4)
        Me.Controls.Add(Me.txtNumber)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.btnCalculateChange)
        Me.Controls.Add(Me.btnCalculate)
        Me.Controls.Add(Me.lstItems)
        Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle
        Me.MaximizeBox = False
        Me.MinimizeBox = False
        Me.Name = "frmMain"
        Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
        Me.Text = "Discount Loyal Customers"
        Me.ResumeLayout(False)
        Me.PerformLayout()

    End Sub
    Friend WithEvents lstItems As System.Windows.Forms.ListBox
    Friend WithEvents btnCalculate As System.Windows.Forms.Button
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents txtNumber As System.Windows.Forms.TextBox
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents txtVAT As System.Windows.Forms.TextBox
    Friend WithEvents Label3 As System.Windows.Forms.Label
    Friend WithEvents txtDiscount As System.Windows.Forms.TextBox
    Friend WithEvents Label4 As System.Windows.Forms.Label
    Friend WithEvents txtAmount As System.Windows.Forms.TextBox
    Friend WithEvents Label5 As System.Windows.Forms.Label
    Friend WithEvents txtTotal As System.Windows.Forms.TextBox
    Friend WithEvents Label6 As System.Windows.Forms.Label
    Friend WithEvents txtChange As System.Windows.Forms.TextBox
    Friend WithEvents btnCalculateChange As System.Windows.Forms.Button

End Class