1. CE En 270 Brigham Young University Norm Jones
Loops – Lecture #1

2. Applications
Traversing through a range of cells or a collection of objects in a systematic fashion
Doing calculations that require iterations
Repeating actions until some condition is met

3. Types of Loops in VB
For Each…
For i=1 To …
Do While…
Do Until…

4. For Each … Loops
For Each… loops are used to loop through a set of items. For example
Cells in a range
Objects in a collection
We have already used For Each… loops, but let’s review them

5. For Each… Syntax Dim myitem As Variant For Each myitem In mycollection
statement(s)
Next myitem

6. Example 1: For Each… Dim mycell As Range
For Each mycell In Range(“B4:D20”)
If mycell.Value < 0 Then
numneg = numneg + 1
End If
Next mycell

7. Example 2: For Each… Dim sh As Shape For Each sh In Shapes
sh.Fill.ForeColor.RGB = vbRed
Next sh

8. For i= … Loops
For i=… loops are used in situations when you know exactly how many times you need to go through the loop
They are useful for traversing through cells or for making computations

9. For i=… Syntax Dim i As Integer For i = Start To End Step inc
statement(s)
Next i
Optional

10. Example 1: For i=… Dim myrow As Integer For myrow = 3 To 17
Cells(myrow, 2) = "Hello"
Next myrow

11. Example 2: For i=… Dim myrow As Integer For myrow = 17 To 3 Step -1
Cells(myrow, 2) = "Hello"
Next myrow

12. Example 3: For i=… Dim i As Integer Dim sum As Integer
For i = 1 To 100
sum = sum + i
Next i

13. Exit For Statement
You can exit any “For" loop at any time using the Exit For statement
This kicks you out of the loop and it moves the execution to the next statement just outside the loop