My First BAPI - Format a string use assign character.

  

FUNCTION ZZW_GET_SETTING_FORMAT.

*"----------------------------------------------------------------------

*"*"Local interface:

*" IMPORTING

*"     REFERENCE(I_FILE) TYPE C

*"     REFERENCE(I_CHARACTER) TYPE C

*"     REFERENCE(I_LENGTH) TYPE I

*" EXPORTING

*"     REFERENCE(E_FILE) TYPE C

*"----------------------------------------------------------------------

 

DATA: LINT_INDEX TYPE I.

      E_FILE = I_FILE.      "Set output file use intput file to format

    LINT_INDEX = I_LENGTH - STRLEN( I_FILE ).

    IF STRLEN( I_FILE ) < I_LENGTH.

        DO LINT_INDEX TIMES.

            CONCATENATE I_CHARACTER E_FILE INTO E_FILE.

        ENDDO.

    ENDIF.

 

 

ENDFUNCTION.

效果图：

output the result: