Excel Loop Column A action column B - excel

Question

I'm currently looking for a code to improve my Dashboard. Actually, I need to know how to use a loop in a column X who will affect a column Y (cell on the same line).
To give you an example:
Column A: I have all Production Order (no empty cell)
Column B: Cost of goods Sold (Sometimes blank but doesn't matter)
I actually pull information from SAP so my Column B is not in "Currency".
The action should be:
If A+i is not empty, then value of B+i becomes "Currency".
It's also for me to get a "generic" code that I could use with other things.
This is my current code...
Sub LoopTest()
' Select cell A2, *first line of data*.
Range("A2").Select
' Set Do loop to stop when an empty cell is reached.
Do Until IsEmpty(ActiveCell)
ActiveCell.Offset(0, 1).Style = "Currency"
ActiveCell.Offset(1, 0).Select
Loop
End Sub

Answer 1

Another example, getting Last Row, in case your data contains any blank rows.
Sub UpdateColumns()
Dim wks As Worksheet
Dim lastRow As Long
Dim r As Long
Set wks = ActiveSheet
lastRow = ActiveSheet.Cells.SpecialCells(xlLastCell).Row
For r = 2 To lastRow
If wks.Cells(r, 1) <> "" Then
wks.Cells(r, 2).NumberFormat = "$#,##0.00"
End If
Next r
End Sub

Answer 2

I can see I was a little slower than the others, but if you want some more inspiration, heer is a super simple solution (as in easy to understand as well)
Sub FormatAsCurrency()
'Dim and set row counter
Dim r As Long
r = 1
'Loop all rows, until "A" is blank
Do While (Cells(r, "A").Value <> "")
'Format as currency, if not blank'
If (Cells(r, "B").Value <> "") Then
Cells(r, "B").Style = "Currency"
End If
'Increment row
r = r + 1
Loop
End Sub

Answer 3

Try the following:
Sub calcColumnB()
Dim strLength As Integer
Dim i As Long
For i = 1 To Rows.Count
columnAContents = Cells(i, 1).Value
strLength = Len(columnAContents)
If strLength > 0 Then
Cells(i, 2).NumberFormat = "$#,##0.00"
End If
Next i
End Sub
Explanation--
What the above code does is for each cell in Column B, so long as content in column A is not empty, it sets the format to a currency with 2 decimal places
EDIT:
Did not need to loop

Answer 4

Here's a really simply one, that I tried to comment - but the formatting got messed up. It simply reads column 1 (A) for content. If column 1 (A) is not empty it updates column 2 (B) as a currency. Changing active cells makes VBA more complicated than it needs to be (in my opinion)
Sub LoopTest()
Dim row As Integer
row = 1
While Not IsEmpty(Cells(row, 1))
Cells(row, 2).Style = "Currency"
row = row + 1
Wend
End Sub