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Thread: Code Logic problem using group boxes, text boxes and check boxes

  1. #1

    Thread Starter
    Registered User
    Join Date
    Jul 2019
    Posts
    2

    Code Logic problem using group boxes, text boxes and check boxes

    Hi all,

    I have made a VB form for a pizza calculator
    • Users are to populate the size of pizza they want (Check Box 1, 2 &3) they can only click one
    • They can choose extra toppings they like (Combo Box 4, 5, 6 & 7- Multiple allowed)
    • Sides they want (Textbox 2, 3, 4) - they can enter a value
    • And a button to calculate the cost, the code does not always include all costs


    Name:  PizzaCalc.png
Views: 238
Size:  17.5 KB

    Code:
    Public Class Form1
        Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
            Dim TotalCost As Double
            TotalCost = 0
    
            If CheckBox1.Checked Then TotalCost = TotalCost + 7
            If CheckBox2.Checked Then TotalCost = TotalCost + 9
            If CheckBox3.Checked Then TotalCost = TotalCost + 10
    
            If CheckBox4.Checked Then TotalCost = TotalCost + 2
            If CheckBox5.Checked Then TotalCost = TotalCost + 2
            If CheckBox6.Checked Then TotalCost = TotalCost + 2
            If CheckBox7.Checked Then TotalCost = TotalCost + 2
    
            TotalCost = TotalCost + 2 * TextBox2.Text + 3 * TextBox3.Text + 5 * TextBox4.Text
    
            TextBox1.Text = TotalCost
        End Sub
    
    
    End Class

  2. #2
    Super Moderator Shaggy Hiker's Avatar
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    Idaho
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    Re: Code Logic problem using group boxes, text boxes and check boxes

    If you want to allow the user only one selection, use Radiobuttons, not checkboxes.
    My usual boring signature: Nothing

  3. #3
    Fanatic Member
    Join Date
    Nov 2017
    Posts
    859

    Re: Code Logic problem using group boxes, text boxes and check boxes

    This is a fantastic time to get in the habit of giving controls meaningful names. If this is part of a school assignment, your instructor would have to do some additional checking to match up your logic with your control names to make sure the prices for sides are correct, prices for the pizza sizes are correct, etc.

    If I were writing this for a school assignment, and once I converted the pizza sizes to radio buttons as suggested above, I might use names like:

    radSmall, radMedium, ... for the size radio buttons
    chkSalami, chkEgg, ... for the toppings check boxes
    txtGarlicBread, txtCanOfDrink, ... for the sides text boxes.

    Its up to you to come up with what works for you, but leaving control names as the default assigned names is a really bad habit to break as soon as possible.

  4. #4
    PowerPoster
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    Sep 2005
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    Modesto, Ca.
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    4,260

    Re: Code Logic problem using group boxes, text boxes and check boxes

    Also, you shouldn't do math with TextBoxes. TextBox1.Text is a String, you should convert that String to a numeric datatype before you do the math,

    Code:
            Dim breadValue As Double
    
            If Me.BreadTextBox.Text.Trim = String.Empty Then
                breadValue = 0
            Else
                If Not Double.TryParse(Me.BreadTextBox.Text, breadValue) Then
                    MessageBox.Show("Invalid Bread Entry")
                End If
            End If
    
    Do this for all TextBox values then do the math
    
    TotalCost = TotalCost + (2 * breadValue) + (3 * drinkValue) + (5 * wingsValue)

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