Shift satetment problem

Question

hi
i am not understanding the output of he last one why the out put is 'abcdefghi'
SHIFT ALPHABET RIGHT DELETING TRAILING M2.
t
DATA: ALPHABET(15) VALUE '     ABCDEFGHIJ',
      M1(4)        VALUE 'ABCD',
      M2(6)        VALUE 'BJJCA '.
SHIFT ALPHABET LEFT DELETING LEADING M1.
The field ALPHABET is unchanged.
SHIFT ALPHABET LEFT DELETING LEADING SPACE.
The field ALPHABET now contains 'ABCDEFGHIJ ' .
SHIFT ALPHABET RIGHT DELETING TRAILING M2.
The field ALPHABET now contains ' ABCDEFGHI'
thanks

Answer 1

Hi sanjeev,
1. I tried the same at my end.
   I was also confused, but now
   i understood what is happening actually.
2. Its not an error.
   Its the way how the ABAP syntax behaves.
3. In your same program (taken from F1 help)
    i have added EXTENSIONS
    which will make clear
    -how this behaves
4. If we take the literal meaning of the words,
   RIGHT = moves the charcters right
   DELETING = Deletes something
   TRAILING = deletes something from right only
   mw       = delete M2 if it is in right only (not in left)
5. Try this code to get a taste of it( just copy paste)
6.
REPORT abc.
DATA: alphabet(15) VALUE ' ABCDEFGHIJ',
m1(4) VALUE 'ABCD',
m2(6) VALUE 'BJJCA '.
SHIFT alphabet LEFT DELETING LEADING m1.
*the field alphabet is unchanged.
SHIFT alphabet LEFT DELETING LEADING space.
break-point.
*the field alphabet now contains 'ABCDEFGHIJ ' .
SHIFT alphabet RIGHT DELETING TRAILING m2
*the field alphabet now contains 'ABCDEFGHI'
EXETENSIONS
alphabet = 'ABCDEFGHIJ'.
m2 = 'IJ'.
SHIFT alphabet RIGHT DELETING TRAILING m2.
*alphabet is 'ABCDEFGH' 'IJ' Deleted
alphabet = 'ABCDEFGHIJ'.
m2 = 'HIJ'.
SHIFT alphabet RIGHT DELETING TRAILING m2.
*alphabet is 'ABCDEFG' 'HIJ' Deleted
alphabet = 'ABCDEFGHIJ'.
m2 = 'GHIJ'.
SHIFT alphabet RIGHT DELETING TRAILING m2.
*alphabet is 'ABCDEF' 'GHIJ' Deleted
break-point.
regards,
amit m.