Variable preceded with exclamation mark

A colleague of mine just noticed something that I have never seen before and can't see the purpose of - preceding a variable with !.
DATA:
mydate TYPE d.
mydate = sy-datum.
ADD 1 TO !mydate.
WRITE: mydate, !mydate.
The memory reference is identical, changing MYDATE changes !MYDATE too. Works for internal tables too.
Odd.
Scott

Hi Christian,
from my point of view, you are perfectly right.
One should try not to use "reserved ABAP words" at all(even if ABAP doesn't have "reserved words" in a technical sense9. And to be perfectly sure to do so, one must follow some naming conventions because you can never be sure that a unprefixed word, that is not an ABAP word today, will not become an ABAP word in a future release.
But this is my personal opinion. Officialy, ABAP does not enforce naming conventions and names that are equal to ABAP words are allowed. In some cases like
DATA i TYPE i.
this can be okay (different namespaces for types and data objects). But other declarations that lead to syntactically correct statements like
READ TABLE TABLE WITH TABLE KEY TABLE = TABLE.
should of course be avoided, even if you do not have to use the escape symbol!
So, it is the developers own responsibility to keep his or her source code readable. Naming conventions can be a great help, but are no necessity. But in fact there should never be a situation, where you use names that force you to use the escape symbol (introducing ! into above READ TABLE statment is not mandatory but would make it more readable).
Regards
Horst

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Edited by: sasi on Jul 23, 2012 7:09 PM

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I have duplicates, triplicates and songs with exclamation marks.

I keep an external drive for iTunes. When I reinstalled iTunes and pointed it to that drive, it imported my playlists, but the songs have exclamation marks. When I click on a song a window pops up asking if I want to locate that list; then the beachball kicks in and I have to perform a force quit.
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to take care of dupes:
_*How to find and remove duplicate items in your iTunes library*_
or [_*Araxis Find Duplicate Files*_|http://www.araxis.com/find-duplicate-files> (free trial)
or [Dupin|http://dougscripts.com/itunes/itinfo/dupin.php] (commercial).
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The ! turns up when iPhoto loses the connection between the thumbnail in the iPhoto Window and the file it represents.
Option 1
Back Up and try rebuild the library: hold down the command and option (or alt) keys while launching iPhoto. Use the resulting dialogue to rebuild. Choose to Rebuild iPhoto Library Database from automatic backup.
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Option 2
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Because this process creates an entirely new library and leaves your old one untouched, it is non-destructive, and if you're not happy with the results you can simply return to your old one. .
When you upgraded to 11 you were warned and you agreed that the Library would be unusable by earlier versions. You explicitly gave your permissions. It wasn't something Apple set up, it's a necessary part of the upgrade process.
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Variable preceded with exclamation mark

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