Identify number of blanks in a string or char field.

Hi Friends,
I have a issue, i have two fields of char30 and the users enters numeric values in that and i have to added the data.
i have to validate the data enter by users before adding.
there are chances that users may enter values like'80 0' then i have to throug an error , how to do that. i am unable to capture that sapce between 80 and 0.
is there any Function module ?
regards
Kumar M

REPORT ZSRK_073    MESSAGE-ID ZMSG                            .
PARAMETERS : P_F1(30),
             P_F2(30).
DATA : L_F(30),
       L_F1 TYPE I,
       L_F2 TYPE I.
AT SELECTION-SCREEN.
L_F1 = STRLEN( P_F1 ).
L_F2 = STRLEN( P_F2 ).
IF P_F1+0(L_F1) CA SPACE.
    MESSAGE E999 WITH 'Space exist in P_F1'.
ENDIF.
IF P_F2+0(L_F2) CA SPACE.
    MESSAGE E999 WITH 'Space exist in P_F2'.
ENDIF.
START-OF-SELECTION.
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_INPUT'
    EXPORTING
      INPUT = P_F1
    IMPORTING
      OUTPUT = P_F1.
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_INPUT'
    EXPORTING
      INPUT = P_F2
    IMPORTING
      OUTPUT = P_F2.
L_F = P_F1 + P_F2.
WRITE : / L_F.

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