Invert digits from columns in Excel 2013

Question

Is it technically possible to flip numbers from all cells in a column without a plugin ?

For example, a two column spreadsheet with

Ref, Weight
3300, 500
3200, 500

Would become

Ref, Weight
0033, 500
0023, 500

Answer 1

Select the cells you wish to process and run this short macro:

Sub flipper()
    Dim r As Range, s As String

    For Each r In Selection
        r.NumberFormat = "@"
        r.Value = StrReverse(r.Text)
    Next r
End Sub

Macros are very easy to install and use:

1. ALT-F11 brings up the VBE window
2. ALT-I ALT-M opens a fresh module
3. paste the stuff in and close the VBE window

If you save the workbook, the macro will be saved with it. If you are using a version of Excel later then 2003, you must save the file as .xlsm rather than .xlsx

To remove the macro:

1. bring up the VBE window as above
2. clear the code out
3. close the VBE window

To use the macro from Excel:

1. ALT-F8
2. Select the macro
3. Touch RUN

To learn more about macros in general, see:

http://www.mvps.org/dmcritchie/excel/getstarted.htm

and

http://msdn.microsoft.com/en-us/library/ee814735(v=office.14).aspx

Macros must be enabled for this to work!

EDIT#1:

If you wish to avoid macros and the cells contain only digits and you are willing to use a "helper column", then with digits in column A, in C1 enter:

=TEXT(SUMPRODUCT(MID(A1,ROW(INDIRECT("1:" & LEN(A1))),1)*10^(ROW(INDIRECT("1:" & LEN(A1)))-1)),REPT("0",LEN(A1)))

and copy down:

From T. Valko's response