inter is and how it's used is a good thing, though you probably don't need to learn a great deal of pointer arithmetic or pointer tricks.
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One topic that you may not want to get into (that many introductory courses cover) are the bit operations. Twiddling bits isn't something that's you have to do in Cocoa (but you can if you want). But I found the subject really helped me understand C better. Nevertheless, if your goal is strictly Cocoa and calculating in base two makes your head hurt, you're 