Q:

Setting window width in Xcode

Probably a very straightforward question. I'd like to set the width of the code editor in Xcode 4 to be exactly 80 characters. Where would I go to do that? Alternatively, if I can make a vertical line appear that indicates the 80 character, that would be fine as well. 
Thanks. 

A:

In Xcode 4:
Xcode menu -> Preferences -> Text Editing Tab -> check Page guide at column:.

