ChangeToNegative.bas

Sub ChangeToNegative()
'Updateby20131113
Dim rng As Range
Dim WorkRng As Range
On Error Resume Next
xTitleId = "Hoc Excel Online"
Set WorkRng = Application.Selection
Set WorkRng = Application.InputBox("Range", xTitleId, WorkRng.Address, Type:=8)
Set WorkRng = WorkRng.SpecialCells(xlCellTypeConstants, xlNumbers)
For Each rng In WorkRng
    xValue = rng.Value
    If xValue > 0 Then
        rng.Value = xValue * -1
    End If
Next
End Sub