Assigning a value to a variable in another procedure

I have been  using excel vba to develop some forms...I have been using text box values as values in my comutations...However since in some cases i need to format the text to a given decimal place i am loosing precision. So my solution is to assign the values to variables and format during the transision from variable to text box....for instance In the example below i am assigning a value to a text box in another form...along these lines how would i assign a value to a variable in a private sub linked to a different form..

'rad is a double variable 
Time_of_Concentration_Form.tb_hydro_rad_CHF5 = rad
'this works fine
Time_of_concentration_form.private sub main (local Variable) = rad
'this i can't do

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PaulHewsConnect With a Mentor Commented:
Using a public variable is a possibility.  The private with property method I showed above would work the same as if you declared a public variable:

Public Rad As Double

Private Sub Main()
    Rad = 5  'Set however you set this variable.
End Sub

Memory consumption isn't much of an issue when we're talking about one double value.  It's only 8 bytes and you would still use that with a private module level variable.
Your local variable has local scope and is inaccessible from outside the form.  The preferred method to keep state in your userform is to use a module level variable and access it with a public property

In your user form:

Private mRad As Double

Private Sub Main()
    mRad = 5  'Set however you set this variable.
End Sub

Public Property Get Rad() As Double
    Rad = mRad
End Property

Public Property Let Rad(Value As Double)
    mRad = Value
End Property

Now you can assign the value using the public property from other code:

Time_of_Concentration_Form.Rad = rad

ToddHawley4984Author Commented:
I've only been programming in VBA for about a week...I understand that its a module level variable but I don't quite understand how to manipulate it

ToddHawley4984Author Commented:
If i'm gonna use a given value in different form should i use a public variable delared in my module?  Is there any real reason not to use public variables other than memory consumption?  I realize if i have a public variable i have to be careful about changing in from different procedures
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