Increment an integer

Question

Sometimes ABAP drives me crazy with really simple tasks such as incrementing an integer within a loop...

Here's my try:

METHOD test.

  DATA lv_id TYPE integer.

  lv_id = 1.

  LOOP AT x ASSIGNING <y>.
    lv_id = lv_id+1.
  ENDLOOP.

ENDMETHOD.

This results in the error message Field type "I" does not permit subfield access.

maybe this works in new abap syntax: lv_id += 1. – Oguz May 14 '21 at 10:06 — Oguz, May 14 '21 at 10:06

vwegert · Answer 1 · 2014-07-18T08:10:19.240

24

You already answered the question yourself, but to make things a bit clearer:

variable + 1

is an arithmetic expression - add 1 to the value of the variable.

variable+1

is an offset operation on a character variable. For example, if variable contains ABC, variable+1 is BC.

This can be especially confusing when dealing with NUMCs. For example, with variable = '4711', variable + 1 is evaluated to 4712, whereas variable+1 is '711' (a character sequence).

The error you saw occurred because it's not possible to perform the index operation on a non-character-like variable.

edited Jul 18 '14 at 08:10

answered Jun 02 '10 at 18:29

vwegert

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Thank you for the explaination. I'm sure I don't make this mistake again ;) – Ben Jun 07 '10 at 14:39

score 15 · Accepted Answer · edited Apr 30 '12 at 12:40

15

You mean like:

ADD 1 to lv_id.

By the way, when you loop over an internal table, SY-TABIX has the loop counter.

edited Apr 30 '12 at 12:40

Wladimir Palant

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answered Jun 02 '10 at 14:46

tomdemuyt

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Just beware of loops within loops. Oh, and if you are looping with a `DO..TIMES x`, then the loop counter will be `SY-INDEX`. Yes, ABAP is a terribly inconsistent language. – Marius Oct 23 '13 at 15:47
1

SY-TABIX does not contain the loop counter, it contains the table index. These are often different values. For instance, if I write `LOOP AT messages INTO msg WHERE type = 'E'`, the first time the loop actually runs might be on the fourth row, and the value of sy-tabix will be 4. – Eric Jul 22 '14 at 18:21

score 8 · Answer 3 · answered Jun 02 '10 at 13:11

8

Uh, I got it. It's the f****** spaces...

lv_id = lv_id + 1

works...

answered Jun 02 '10 at 13:11

Ben

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...but if there is a more elegant way, I would be interested ;) – Ben Jun 02 '10 at 13:12

score 1 · Answer 4 · answered Apr 22 '16 at 11:23

1

Simple

DATA : gv_inc type I .

place this statement in loop

gv_inc = gv_inc + 1 .

answered Apr 22 '16 at 11:23

Android Genius

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score 1 · Answer 5 · answered Jan 30 '23 at 12:43

1

from SAP NetWeaver Version 7.54 you can also use:

lv_id += 1.

Instead of

lv_id = lv_id + 1.

Happy coding!

answered Jan 30 '23 at 12:43

Frontmaniaac

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score 0 · Answer 6 · answered Jul 17 '17 at 16:25

0

If you are going to increment every loop cycle than you can directly get the table size.

describe table x lines data(lv_id). "Out side of the loop.

answered Jul 17 '17 at 16:25

Increment an integer

6 Answers6