squred

[tarik666]

in a visual basic function how do I square something like

cnsquared

[Jenner]

2^2 = 4
3^2 = 9
4^2 = 16
5^2 = 25
...

[tarik666]

Thanks for helping

[stanav]

x = y ^ 2
Or use the Math.Pow function
x = Math.Pow(y, 2)

[tarik666]

cool how do I then create a global variable

I want to store the answer in a global variable

[Shaggy Hiker]

How global do you mean? You could add a module to your project, and make a public variable in the module. That variable would be visible to the whole project. However, it is generally good practice to limit visibility to only those parts that actually need to see it, so globals are not used all that much.

[tarik666]

Well if I save a sum as answer and I want to display it on the next form what is the best way I can do that

[Jenner]

Yea... if you have in your form:

Public Class Form1
    Dim blah as Integer

End Class

Then "blah" will be seen to everything in Form1, and that's good enough for 99.9% of things.

[Jenner]

If you want to send it to another form, then make a Property on that form and send it over, here's Form1:

Public Class Form1
    Dim _blah As Integer

    Private Sub MakeForm2()
        Dim f As New Form2
        f.Blah = _blah
        f.Show()

    End Sub
   
End Class

Here's Form2:

Public Class Form2
    Dim _blah As Integer

    Public Property Blah() As Integer
        Get
            Return _blah
        End Get
        Set(ByVal value As Integer)
            _blah = value
        End Set
    End Property

End Class

[Shaggy Hiker]

A global is the easiest.

The major issue people are dealing with concerning globals is that any part of a program can change a global, so you have the problem that the name of the variable could conflict (if you don't keep track of what names you have for variables), and the state of the global could be changed by other parts of a program. In many programs, especially smaller ones, the first issue is unlikely to be a problem, and the second issue won't be a problem.

However, it's not a good habit to get into. If the sum is calculated on one form, and you want to display it on another form, there are many options you can choose from:

If the second form is not created until after the sum has been calculated, then you can either add a custom constructor to the new form that takes the sum as an argument, or you can put a WriteOnly property on the new form that accepts the sum and shows it, or you can expose the sum via a property on the first form, though this could be much more difficult. In addition to those, you can simply add the sum to a control when you create the second form.

If the second form already exists when the sum is generated, then if the second form is visible to the first form, you can either add a WriteOnly property to the second form, or you can add the sum as a string directly to a control.

[Shaggy Hiker]

Boy was I slow.

[tarik666]

Alright cause normally to pass variables to another form I create a variable on the form I want to pass it to and say the variable was username and the user entered their username in a text box on the prvious form i just say

dim username = form1.username_txt

so if the other way is better I wil have to start using it