Objective-C 2nd Edition with Xcode 7

Hi All,
N00b here. I am just getting started with the exciting journey of self teaching myself cocoa/cocoa-touch with Objective-c with this tome. My quick question is, would i need to modify the source code for the book to make them run in Xcode7(I am on Elcapitan and Xcode7- I had no choice when I bought my macbook air)? If so, what modifications do i need to do?