There are no codes in clash of clans.
Clan code is a unique code given to each clan for its identification, you can look up for a certain clan (as there are many clans with same name), it contains numbers, letters and this '#' symbol at the starting.
There is no code as the gameplay data of the game is saved on their servers! You can't hack their servers!
"Code of the Clans" has approximately 176 pages in paperback format.
The ISBN of Code of the Clans is 978-0061660092.
Code of the Clans was created on 2009-06-09.
In secrets of the clans, code of the clans, and on the warrior cats website: http://www.warriorcats.com
Bluestar's prophecy was released July 28, 2009. Code of the clans was released June 9, 2009.
Thunderclan
Sky (Revealed in Code of the Clans)
on harpercollins.com
Firestar, Blackstar, Tallstar, and Leopardstar
Well yes of course they have a code called The Warrior Code. Go to www.warriorcats.com. Once you explore the site you'll find the warrior code on there, also field guides contain the warrior code in published print.