こんにちは私はvbaを初めて使用するので、あまり理解できないかもしれませんが、コードでセルの背景色を変更する必要があるときに、「ランタイムエラー9：添え字が範囲外です」というエラーが発生する理由を説明できません。別の
Sub CompareWorksheets(ws1 As Worksheet, ws2 As Worksheet)
Dim r As Long, c As Integer
Dim lr1 As Long, lr2 As Long, lc1 As Integer, lc2 As Integer
Dim maxR As Long, maxC As Integer, cf1 As String, cf2 As String
Dim DiffCount As Long
Application.ScreenUpdating = False
With ws1.UsedRange
lr1 = .Rows.Count
lc1 = .Columns.Count
End With
With ws2.UsedRange
lr2 = .Rows.Count
lc2 = .Columns.Count
End With
maxR = lr1
maxC = lc1
If maxR < lr2 Then maxR = lr2
If maxC < lc2 Then maxC = lc2
DiffCount = 0
For c = 1 To maxC
For r = 1 To maxR
cf1 = ""
cf2 = ""
On Error Resume Next
cf1 = ws1.Cells(r, c).FormulaLocal
cf2 = ws2.Cells(r, c).FormulaLocal
On Error GoTo 0
If cf1 <> cf2 Then
DiffCount = DiffCount + 1
ws1.Cells(r, c).Activate
ws1.Cells(r, c).Select
=============> ws1.Cells(r, c).Interior.ColorIndex = RGB(200, 20, 20) <============
End If
Next r
Next c
Application.ScreenUpdating = True
End Sub