Equation Help ::: How to Concatenate a Equation and Answer to text Box

[PsycoZL]

Hello Everyone,

In our school theres a programming class and the teachers gone for the week and the sub is starting to get very frustrated, so I offered to help in any way i can. I have never programmed Visual Basic but I have programmed Ms-Dos, Javascript, HTML, *.vbs, *.ahk, *.gml, and a variety of other languages.

The class is going to build a program that calculate how many rabbits are born in a family. So when they click the button it shows in a text box the actual equation and then the answer after the equal sign that where i assume concatenation comes in.

Here's the code I've thrown together for when the buttons pressed:

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim RabitAmount As Integer
        Dim ShowEquation As String

        RabitAmount = TextBox1.Text
        ShowEquation = "Textbox1.text * 4 = "
        TextBox2.Text = ShowEquation
        TextBox2.Text = ((RabitAmount) * 4)

    End Sub
End Class

I got the equation to answer it self and show in the text box but it won't show the equation before hand can you please let me know what i'm doing wrong and how to fix it?

Thanks,

-PsycoZL

[.paul.]

RabitAmount = cint(TextBox1.Text)
ShowEquation = RabitAmount.tostring  & " * 4 = "
TextBox2.Text = ShowEquation
TextBox2.Text &= " = " & ((RabitAmount) * 4).tostring

[PsycoZL]

Ok I fixed some of it Heres the new code:

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim RabitAmount As Integer
        Dim ShowEquation As String

        RabitAmount = TextBox1.Text
        ShowEquation = TextBox1.Text & " * 4 = "

        TextBox2.Text = ShowEquation & (RabitAmount * 4)



    End Sub
End Class

Is there a way to not overwrite the data entered into textbox2?

Also is there a simpler way of doing this?

Thanks,

-PsycoZL

[PsycoZL]

Oh cool thanks for the quick reply I didn't see this i was typing out other reply thanks.

[Shaggy Hiker]

By the way, CInt will throw an exception if you enter anything that is not an integer. Integer.TryParse would be the safer way to go, but whether or not you want to go there depends on where the class is at.

[PsycoZL]

So what if you wanted to reverse i and allow only letters and no numbers? Also is there a way to prevent the overwriting of the data sent to textbox2? Because every time the the buttons pressed the old data disappears and the new appears I want them both there old below the new.

Thanks,

-PsycoZL

[.paul.]

TextBox2.Text &= environment.newline & ShowEquation & (RabitAmount * 4)

[PsycoZL]

This is great thank you guys for all your help I really appreciate it!!!

Thanks,

PsycoZL