When a bill is signed by the President into law, it is called a Public Law and immediately assigned a number and printed.
Session Laws - Annual publication of public laws in chronological order in the set, United States Statutes at Large
The U.S. Code is the official codification by subject matter of the general and permanent laws of the United States. It is divided by broad subjects into 50 titles and published by the Office of the Law Revision Counsel of the U.S. House of Representatives.
There are two unofficial annotated versions of the U.S. Code