DATA : LV_FORMULA  TYPE CHAR100,
       LV_VALUE    TYPE F,
       LV_RESULT   TYPE CHAR100,
       LV_RETCODE  LIKE SY-SUBRC,
       LV_MESSAGE  TYPE MSGTXT,
       LV_CALC_AMT TYPE P DECIMALS 2.

* Input Value
LV_FORMULA = '(10*5)/10+i'.

CONDENSE LV_FORMULA.
REPLACE ALL OCCURRENCES OF 'i' IN  LV_FORMULA WITH '1'.

* Check Fomula
CALL FUNCTION 'CHECK_FORMULA'
  EXPORTING
    FORMULA           = LV_FORMULA
  IMPORTING
    SUBRC             = LV_RETCODE
    MESSAGE           = LV_MESSAGE
  EXCEPTIONS
    ERROR_IN_FORMULA  = 1
    MISSING_PARAMETER = 2
    OTHERS            = 3.

CHECK LV_RETCODE IS INITIAL AND SY-SUBRC EQ 0.

* Eval Fomula
CALL FUNCTION 'EVAL_FORMULA'
  EXPORTING
    FORMULA                 = LV_FORMULA
  IMPORTING
    VALUE                   = LV_VALUE
  EXCEPTIONS
    DIVISION_BY_ZERO        = 1
    EXP_ERROR               = 2
    FORMULA_TABLE_NOT_VALID = 3
    INVALID_EXPRESSION      = 4
    INVALID_VALUE           = 5
    LOG_ERROR               = 6
    PARAMETER_ERROR         = 7
    SQRT_ERROR              = 8
    UNITS_NOT_VALID         = 9
    MISSING_PARAMETER       = 10
    OTHERS                  = 11.

* Write
LV_CALC_AMT = LV_VALUE.
WRITE: LV_CALC_AMT TO LV_RESULT STYLE CL_ABAP_FORMAT=>O_SIMPLE.
CONDENSE LV_RESULT.

WRITE : LV_RESULT.