The following resources contain additional information on Objective C. Please use them to get more in-depth knowledge on this topic.
Learn Objective-C − A tutorial written and illustrated by Scott Stevenson
Online Objective-C Compiler − Compile and run your Objective-C program online.
Objective-c Sstyle Guide − These guidelines build on Apple's existing Coding Guidelines for Cocoa.
Objective C on wikipedia − Short tutorial on Objective C on Wikipedia.
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