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Excel VBA - Basics videos | Excel VBA Part 15.1 - Do Until and Do While Loops

Posted by Andrew Gould on 06 February 2014

Excel VBA Part 15.1 - Do Until and Do While Loops

Do Loops in VBA allow you to carry out a set of instructions repeatedly until some kind of condition is met. This video teaches you about the basics of the Do Loop statement including how to write Do Until and Do While loops, where to place your conditional statements and how to exit from a loop. The final part of the video provides a couple of longer examples using Do Loops.

See our full range of VBA training resources, or test your knowledge of VBA with one of our VBA skills assessment tests.

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This page has 1 thread

From:	Costas
When:	24 Apr 17 at 11:26

Hi,

I was wondering if you could help with the following question. Why the Do Loop stops when it comes accross a value of 0 in a table with integer numbers? How can I handle such a case?

Thanks in advance for the help.

Costas

From:	Andrew G
When:	24 Apr 17 at 11:56

Hi, what have you written as your Do Until or Do While statement? If you're testing for an empty string as shown in the video then this code will reach the end of the list, even if it contains 0:

Range("A1").Select

Do Until ActiveCell.Value = ""
'do something useful
ActiveCell.Offset(1, 0).Select
Loop

If that's not working for you, you could try using the IsEmpty function instead, like so:

Range("A1").Select

Do Until IsEmpty(ActiveCell.Value)
'do something useful
ActiveCell.Offset(1, 0).Select
Loop

I hope that helps!

From:	Costas
When:	24 Apr 17 at 12:24

Hi thanks for the prompt response. I think I got it..

Excel reads the 0 number as an empty cell. So the loop stops because of that. Hence, in my vba code which manipulates time-series price data, I need to add some kind of condition (eg. offset) for the loop to continue.

Thanks a lot once more.

From:	Andrew G
When:	25 Apr 17 at 11:23

The Empty keyword is used for testing uninitialised Variant variables, not the contents of cells. That's why this video doesn't include any mention of using the Empty keyword.

From:	Costas
When:	25 Apr 17 at 09:30

Hi Andrew,

The simple code I am testing is the following:

Sub DoUntilStatemet()

Range("b1").Select

Do Until ActiveCell = Empty

Select Case ActiveCell
Case 0 To 0.5
ActiveCell.Offset(0, 7).Value = "Positive"
Case 0.51 To 1
ActiveCell.Offset(0, 7).Value = "Very Positive"
Case Else
ActiveCell.Offset(0, 7).Value = "Negative"
End Select

ActiveCell.Offset(1, 0).Select
Loop

End Sub

I notice a difference between the keyward "Empty" that I use instead of " " or the function "IsEmpty".

Empty works with non-zero values. The other suggestions work regardless. I didnt knew that detail.

Thanks

From:	Andrew G
When:	25 Apr 17 at 06:49

Hi, it shouldn't be necessary to add another condition - both of the examples shown above will loop to the end of a list which contains 0. Which condition are you testing for in your current code?

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