How can I determine the number of field in the FIELD-SYMBOLS

Hi, in the following code example I have structure u201Czfsl_sd_credit_balu2019 I define a workarea like that structure and assign that wa to FIELD-SYBOLS. Now can I calculate the number of filed in that FIELD-SYBOLS for further processing on that FIELD-SYBOLS.
DATA: wa_credit_bal LIKE zfsl_sd_credit_bal.
"wa_credit_bal-audat = '20081210'.
wa_credit_bal-vehno = '0as10'.
wa_credit_bal-VBELN = 'aaad'.
wa_credit_bal-MOVMT = 'asdfa'.
wa_credit_bal-quantity = 10.
wa_credit_bal-recc = 10.
wa_credit_bal-recb = 10.
wa_credit_bal-issc = 10.
wa_credit_bal-issb = 10.
wa_credit_bal-balc = 10.
wa_credit_bal-balb = 10.
wa_credit_bal-cbalc = 10.
wa_credit_bal-cbalb = 10.
wa_credit_bal-last_line = 2.
FIELD-SYMBOLS: <f1>, <f2>, <f3>.
ASSIGN wa_credit_bal TO <f1>.
In the bellow u2018FORMu2019
FORM getsum USING in CHANGING out etext.
FIELD-SYMBOLS: <f1>, <f2>.
ASSIGN in TO <f1>.
out = 0.
DATA: cin(50),
        iin TYPE i.
DO 14 TIMES.
    CATCH SYSTEM-EXCEPTIONS conversion_errors = 1.
      ASSIGN COMPONENT sy-index OF STRUCTURE <f1> TO <f2>.
      iin = <f2>.
    ENDCATCH.
    IF sy-subrc = 1.
    ELSE.
      ADD: <f2> TO out.
    ENDIF.
ENDDO.
I did u201CDO 14 TIMESu201D because I know that there are 14 field in that structure but it will be problem when user will give a different structure like more then 14 fields in it. So I want to get the no of fields and store it to a variable and replace u201814u2019 with that variable
Kind regards,
Faisal

Thanks, Tahir
my problem has solved
Kind Regards,
Faisal

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