Welcome to the first post in a new Question & Answer series, where Mobiletuts+ authors will be responding to questions posted in the comments section of tutorials on this site or e-mailed directly to the editor. In this Q&A session, Mark Hammonds answers questions left on Dan Walker's post "Learn Objective-C: Day 1" and also on his own post, "iPhone SDK: In-App Purchases."
Mobiletuts+ is a tutorial site aimed at mobile developers. We run tutorials on technologies such as the iOS SDK, Android SDK, Titanium Mobile, HTML5 Web Apps, and more!