Add spaces in arithmetic expressions

Hi experts,
i have to insert spaces in arithmetical expressions written by users.
For example:
INPUT (by USERS): A+B-SQRT(C)/(D**2)
OUTPUT (by Program): A + B - SQRT( C ) / ( D ** 2 )
Possible arithmetic operators are:
+; - ; *; /; **; SQRT()
Any hints will be rewarded.
Thanks in advance.
Fabio.

Thanks to all guys!
the right code is a mixt of yours hints:
l_len = STRLEN( tb_mzcatc-/bic/zformatc ).
DO.
    l_char = input+n(1).
    CASE l_char.
      WHEN 'Q' OR
           'R'.
        CONCATENATE formula l_char INTO formula.
      WHEN 'T'.
        l_char = input+n(2).
        CONCATENATE formula l_char INTO formula.
        n = n + 1.
      WHEN '*'.
        IF input+n(2) = '**'.
          l_char = input+n(2).
          CONCATENATE formula l_char INTO formula SEPARATED BY ' '.
          n = n + 1.
        ELSE.
          CONCATENATE formula l_char INTO formula SEPARATED BY ' '.
        ENDIF.
      WHEN OTHERS.
        CONCATENATE formula l_char INTO formula SEPARATED BY ' '.
    ENDCASE.
    n = n + 1.
    IF n GT l_len.
      EXIT.
    ENDIF.
ENDDO.
Message was edited by:
        Fabio Cappabianca

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"steelkat" <[email protected]> wrote in
message
news:e5fapn$kmo$[email protected]..
> Is there a way to add space between the menu items in
generated by Pop
> Menu
> Magic? By this I mean, can you have the various menu
items (the "tabs" or
> "buttons") exist with some space between them <a
target=_blank
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> href="
http://css.maxdesign.com.au/listamatic/vertical11.htm">(something
> like
> this but with maybe more space)</a>, as opposed to
the default way the
> "tabs"
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target=_blank
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>
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close sometimes
> but
> no cigar.....I have tried messing with the list items in
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> itself,
> but no luck there either.
>
> Hope I am making enough sense here....
>
> Thanks,
>
> Tommy
>

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