topic Logical Expression in Application Development and Automation Discussions

Logical Expression

Former Member — Thu, 07 Jul 2011 10:58:12 GMT

Hi,

I have an internal table contains field for logical expression EQ, GE, GT etc.

I would like to use this logical expression in my ABAP code.

For example

READ TABLE INTAB INDEX 1.

Comparing the value of a and b based on the logical expression from the INTAB.

How can i achieve this ?

Thanks.

Regards,

Jon

Re: Logical Expression

Former Member — Thu, 07 Jul 2011 11:07:13 GMT

Hi,

I doubt if we can pass a variable in place of logical expression.

You can try by reading your internal table, and having various if conditions.But that doesnt look like a good solution.

Re: Logical Expression

former_member585060 — Thu, 07 Jul 2011 11:21:15 GMT

Hi,

Make use of macros, just check below example.

DATA : lv_abc  TYPE i VALUE 5,
       lv_bca  TYPE i VALUE 3.


DEFINE mac.

  if lv_abc &1 lv_bca.
    write :/ 'Bala'.
  else.
    write :/'Krishna'.
  endif.

END-OF-DEFINITION.

mac gt.

In above code, you can pass the INTAB table field value with the defined macro.

Ex:-

mac intab-field.

Regards

Bala Krishna.

Re: Logical Expression

Former Member — Thu, 07 Jul 2011 14:22:45 GMT

Yes, i have try not to use if and else condition to fulfill the requirement.

Hi Bala,

Thanks for providing example, however i'm not really get it on how to use it.

I will provide more details scenario

Table ZTAB consist of following structure and records

abc GT

cef EQ

a = 50.

b = 100.

READ TABLE ztab with key field = 'abc'.

Based on the table entries from ztab, i sud use the operation GT to compare between value a and b.

so instead of using this way

IF ztab-sign = 'GT'.

IF a GT b.

WRITE: 'Successful'

ENDIF.

Is there a way to define the operation based on the table entries ?

Thanks.

Re: Logical Expression

Former Member — Thu, 07 Jul 2011 16:27:45 GMT

Hi,

you could use an approach populating a RANGE.

For example:


DATA: BEGIN OF ztab OCCURS 0,
        field(10) TYPE c,
        operator(2) TYPE c,
      END OF ztab.

RANGES: r_field FOR sbfadxth-keychar10. "any DDIC field with the same
                                        "type as ZTAB-FIELD

INITIALIZATION.
* Just initializing the example you provided
  ztab-field = 'abc'.
  ztab-operator = 'EQ'.
  APPEND ztab.

  ztab-field = 'cef'.
  ztab-operator = 'GT'.
  APPEND ztab.

START-OF-SELECTION.
  READ TABLE ztab WITH KEY field = 'abc'.
  IF sy-subrc = 0.
*   Now you'll fill the range according to the entry you've just READ
    CLEAR: r_field.
    REFRESH: r_field.

    r_field-sign = 'I'.
    r_field-option = ztab-operator.
    r_field-low = ztab-field.
    r_field-high = space.
    APPEND r_field.

*   Finally you make the comparison
    IF a IN r_field.
      WRITE: 'Successful'.
    ENDIF.

  ENDIF.

I hope this helps. Kind regards,

Alvaro

Re: Logical Expression

Clemenss — Thu, 07 Jul 2011 22:10:22 GMT

Hi O. SITI EPBP,

you could create form routines for the operators and call them dynamically.

PERFORM (ztab-sign) using a b changing result.
WRITE: / a,ztab-sign,b,'is',result.

FORM GT using p_val_a p_val_b changing p_result.
  IF  p_val_a  > p_val_b .
    p_result. = 'TRUE'.
  ELSE.
    p_result. = 'FALSE'.
  ENDIF.
ENDFORM.
FORM LT using p_val_a p_val_b changing p_result.
  IF  p_val_a  < p_val_b .
    p_result. = 'TRUE'.
  ELSE.
    p_result. = 'FALSE'.
  ENDIF.
ENDFORM.

Create one form for each operator.

Regards,

Clemens

Re: Logical Expression

former_member585060 — Fri, 08 Jul 2011 06:54:07 GMT

Hi,

The required code has to be declared in the Macro defination, it is define between the statement DEFINE and END-OF-DEFINATION, with the help of CASE statement you can code for all the possible Options. Just check the below example.

DATA : v_aaa TYPE i VALUE 50,
       v_bbb TYPE i VALUE 100.

TYPES : BEGIN OF ty_ztab,
          field  TYPE c LENGTH 5,
          option TYPE c LENGTH 2,
        END OF ty_ztab.

DATA : i_ztab  TYPE TABLE OF ty_ztab,
       wa_ztab TYPE ty_ztab.


DEFINE macro.

  case &1.
    when 'GT'.

      if v_aaa gt v_bbb.
        write :/ v_aaa, 'Greater than', v_bbb.
      else.
        write :/ v_aaa, 'Less than', v_bbb.
      endif.

    when 'EQ'.

      if v_aaa eq v_bbb.
        write :/ 'Equal'.
      endif.

    when 'LT'.

    when 'NE'.

    when others.
  endcase.

END-OF-DEFINITION.


START-OF-SELECTION.

  wa_ztab-field = 'abc'.
  wa_ztab-option = 'GT'.
  APPEND wa_ztab TO i_ztab.
  CLEAR : wa_ztab.

  wa_ztab-field = 'cef'.
  wa_ztab-option = 'EQ'.
  APPEND wa_ztab TO i_ztab.
  CLEAR : wa_ztab.

  READ TABLE i_ztab INTO wa_ztab WITH KEY
                    field = 'abc'.
  IF sy-subrc = 0.
    macro wa_ztab-option.
  ENDIF.

Output will be :- 50 Less than 100, which is written in ELSE condition of the CASE condition GT.

Regards

Bala Krishna.

Re: Logical Expression

Former Member — Fri, 08 Jul 2011 14:09:02 GMT

Hi Alvaro ,

Thanks for the solution. Point Rewarded.

Hi Bala,

Your solution will work too, however i try to eliminate using too much IF and ENDIF statement for this requirement.

But thanks for your details explanation.