In SAP ABAP, you can reverse a string using different techniques, as ABAP does not provide a built-in REVERSE function. Here are some methods to achieve string reversal:

1. Using String Processing (SHIFT, CONCATENATE)

This method loops through the string from the end to the beginning and constructs the reversed string.

Example

DATA: lv_text  TYPE string VALUE 'ABAP',
      lv_result TYPE string,
      lv_char   TYPE char1,
      lv_len    TYPE i.


lv_len = strlen( lv_text ). " Get string length


DO lv_len TIMES.
  lv_char = lv_text+lv_len-1(1). " Extract character from the end
  CONCATENATE lv_result lv_char INTO lv_result. " Append to result
  lv_len = lv_len - 1.
ENDDO.


WRITE: lv_result. " Output: PABA

2. Using CL_ABAP_STRING_UTILITIES=>REVERSE (Newer ABAP Versions)

If you’re using ABAP 7.40+, SAP provides a built-in method for reversing strings.

Example

DATA(lv_text) = 'ABAP'.
DATA(lv_reversed) = CL_ABAP_STRING_UTILITIES=>REVERSE( lv_text ).


WRITE: lv_reversed. " Output: PABA

3. Using an Internal Table (Character-by-Character)

This method converts the string into a table of characters, then reads it in reverse order.

Example

DATA: lv_text TYPE string VALUE 'ABAP',
      lt_chars TYPE TABLE OF char1,
      lv_result TYPE string.


DATA(lv_len) = strlen( lv_text ).


" Split string into characters
DO lv_len TIMES.
  APPEND lv_text+sy-index-1(1) TO lt_chars.
ENDDO.


" Convert internal table back to string
LOOP AT lt_chars INTO DATA(lv_char).
  CONCATENATE lv_result lv_char INTO lv_result.
ENDLOOP.


WRITE: lv_result. " Output: PABA

Best Method?