Form number field decimals based on a second field

An expert helped me a while back with this topic but for some reason it is not working as I thought it was.

I have two fields on a form.  The first one is named "txtC_SIG_FIG" and is a number field and the data entered into this field is always a whole number with no decimals.  The 2nd one is named "txtC_MIN".  When a number is entered into the 2nd field I want it to carry out to the number of decimals entered in the 1st field.

So, for example, if txtC_SIG_FIG is 3, and if I enter 1.23412 in the 2nd field, I want the result in the 2nd field to display as 1.234

But if the value in txtC_SIG_FIG is 4, and if I enter 1.23412 in the 2nd field, I want the result in the 2nd field to display as 1.2341

Note:  The properties of the 2nd field in the table and on the form is Standard, auto decimals.

The current code which is not working is:

Me.txtC_MIN = Format([txtC_MIN], "0." & Right(10 ^ [txtC_SIG_FIG], Len(10 ^ [txtC_SIG_FIG]) - 1))
SteveL13Asked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

PatHartmanCommented:
Here's a function I found some place.  I didn't write it and I'm sorry I don't remember who did.

Function RoundToNearest(dblNumber As Double, varRoundAmount As Double, _
   Optional varUp As Variant) As Double
   
'''The following example creates a user-defined function called RoundToNearest, which accepts three parameters:
'''
'''dblNumber        The numeric value you want to round
'''varRoundAmount   The increment to which dblNumber will be rounded
'''varUp            An optional argument: include to round up; omit to round down
''' For example:
''''•RoundToNearest(3.33, 0.1, up) returns the value 3.4.'
''''•RoundToNearest(3.33, 0.1) returns the value 3.3.
''''.RoundToNearest(3.45678, 0.001) returns the value 3.456.
''''•RoundToNearest(3.33, 1, up) returns the value 4.'
''''•RoundToNearest(3.33, 1) returns the value 3.
         
   Dim dblTemp As Double
   Dim intTemp As Integer
   
   dblTemp = dblNumber / varRoundAmount
   intTemp = Int(dblTemp)
   
   If intTemp = dblTemp Then
      RoundToNearest = dblNumber
   Else
      If IsMissing(varUp) Then
         ' round down
         dblTemp = intTemp
      Else
         ' round up
         dblTemp = intTemp + 1
      End If
      RoundToNearest = dblTemp * varRoundAmount
   End If
End Function

Open in new window


print roundtonearest(3.45678, .001)
 3.456
0
Russell FoxDatabase DeveloperCommented:
This treats it like text, searching for the "." and moving the appropriate number of places past that:
=LEFT(TEXT(txtC_MIN,"#.############"), SEARCH(".",txtC_MIN)+txtC_SIG_FIG)

Open in new window

0
Gustav BrockCIOCommented:
This truncates the decimals while performing a 4/5 rounding:

Me.txtC_MIN  = Format([txtC_MIN], "0." & String([txtC_SIG_FIG], "0"))

/gustav
0
The Ultimate Tool Kit for Technolgy Solution Provi

Broken down into practical pointers and step-by-step instructions, the IT Service Excellence Tool Kit delivers expert advice for technology solution providers. Get your free copy for valuable how-to assets including sample agreements, checklists, flowcharts, and more!

SteveL13Author Commented:
I think we're getting close.  If I enter 1.12345 and the decimal qualifier is 3 I get 1.123  -  Perfect.

But if I enter 1.1 I get 1.1 and want to see 1.100

In other words, the number of decimals shown should always be the decimal qualifier (txtC_SIG_FIG)

????
0
Gustav BrockCIOCommented:
Then you'll have to adjust the Format property of the textbox as well:

Me.txtC_MIN.Format  = "0." & String([txtC_SIG_FIG], "0")

/gustav
0
SteveL13Author Commented:
Once more..  this is working great...

Me.txtC_MIN.Format  = "0." & String([txtC_SIG_FIG], "0")

But if the decimal qualifier is "0" and I enter 1 I am getting "1." (with the decimal.

Is there a way to get rid of the decimal if I enter a whole number and the qualifier is "0"?
0
Gustav BrockCIOCommented:
Yes, though not very smart:

Me.txtC_MIN  = Format([txtC_MIN], "0" & Left(".", [txtC_SIG_FIG]) & String([txtC_SIG_FIG], "0"))
Me.txtC_MIN.Format  = "0" & Left(".", [txtC_SIG_FIG]) & String([txtC_SIG_FIG], "0")

/gustav
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft Access

From novice to tech pro — start learning today.