Reverse a string using shift

[Former Member]

Hi,

A quick search could not provide me with an answer whether in ABAP we can reverse a string using the SHIFT keyword alone? I am not supposed to use the function or the offset and length. Also, my data object is a string type, not a character type.

In which ever way I tried, I am breaking the code when characters repeat successive in the string.

Thanks.

[Former Member]

The circular shift just shifts the first character tot he last and so on.

The catch is not to use the offset and length.

We could have acheived by using a combination of left right shift, but then the STRING data type will always contain all the characters however shifted.

[Former Member]

shift circular comes to mind...

you could get the length and shift circular up to lv_length places?

In NetWeaver 7.02, I think there's a statement that does....At least, I think I saw that in Thomas Jung's presentation on the future of ABAP.

[Former Member]

The circular shift just shifts the first character tot he last and so on.

The catch is not to use the offset and length.

We could have acheived by using a combination of left right shift, but then the STRING data type will always contain all the characters however shifted.

[deepak_dhamat]

Hi ,

use function STRING_REVERSE

Pass String 'Deepak'

Language keep blank it will take default .

it will show output kapeed

Regards

Deepak.

[deepak_dhamat]

This message was moderated.

[Former Member]

Guys, thanks for posting. But I guess you overlooked my question.

I am supposed to use only the SHIFT and its variants. No offset, no function.

[asik_shameem]

If you are allowed to use STRLEN keyword. You can try like this.

DATA: gv_text      TYPE STRING VALUE 'Hello. How are you?',
      gv_text_temp TYPE STRING .

DATA: gv_length TYPE i,
      gv_index  TYPE i.

DATA: gt_char  TYPE TABLE OF c,
      gwa_char TYPE c.

gv_length = STRLEN( gv_text ).

gv_text_temp = gv_text.

DO gv_length TIMES.

  gv_index = gv_length - sy-index.

  SHIFT gv_text BY gv_index PLACES.

  gwa_char = gv_text.

  APPEND gwa_char TO gt_char.

  gv_text = gv_text_temp.

ENDDO.

LOOP AT gt_char INTO gwa_char.
  WRITE: gwa_char.
ENDLOOP.

[Former Member]

A combination of SHIFT LEFT and SHIFT RIGHT CIRCULAR can do the trick.

PARAMETERS in_str TYPE string.

DATA : length TYPE i,
      index TYPE i,
      rev_str LIKE in_str,
      buf_str LIKE in_str.

length = STRLEN( in_str ).
index = length - 1.
buf_str = in_str.

DO length TIMES.
  SHIFT buf_str BY index PLACES.
  CONCATENATE rev_str buf_str INTO rev_str.
  buf_str = in_str.
  SHIFT buf_str BY sy-index PLACES RIGHT CIRCULAR.
ENDDO.

WRITE / rev_str.

[Former Member]

I thought you weren't supposed to use length.

[former_member214857]

Hi

You can use code below as a FORM in your code

DATA:
  x_string(50) TYPE c VALUE 'ABCDE',
  x_length     TYPE i,
  x_revert(50) TYPE c,
  x_index      TYPE i.


 x_length = strlen( x_string ) + 1.


 DO x_length TIMES.
    x_index = sy-index - 1.
    CONCATENATE x_string+x_index(1) x_revert INTO x_revert.
 ENDDO.

 WRITE x_revert.

Kind regards

[Former Member]

Use FM CALL FUNCTION 'STRING_REVERSE'

REPORT ZSTRINGREV .

Parameters: p_string(200).
Data: r_string(100).

CALL FUNCTION 'STRING_REVERSE'
  EXPORTING
    STRING          = p_string
    LANG            = 'E'
 IMPORTING
   RSTRING          = r_string
 EXCEPTIONS
   TOO_SMALL        = 1
   OTHERS           = 2
          .
IF SY-SUBRC <> 0.
 MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
         WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.

*Inputted String.

Write:/ 'Inputted String', p_string.
SKIP.

*The reverse string.
Write:/ r_string.

Edited by: kk.adhvaryu on Oct 2, 2010 6:54 AM

[sunojmichael1]

This message was moderated.