data:lv_value type string. 
 
call function 'EVAL_FORMULA' 
  exporting 
    formula                 = '90 <= 90' 
    program                 = sy-repid 
  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. 
if sy-subrc <> 0. 
* Implement suitable error handling here 
endif.

FORM dynamicformula USING  　　formula 　TYPE string 
                    CHANGING 　re 　　　 TYPE i. 
  DATA source TYPE string. 
  DATA return_value TYPE string. 
  DATA js_processor TYPE REF TO cl_java_script. 
  js_processor = cl_java_script=>create( ). 
  CONCATENATE 
    'result = ' 
    formula 
     ';' 
   INTO source. 
  return_value = js_processor->evaluate( source ). 
  re = return_value. 
ENDFORM.