C or C++ on mac

i just install Xcode and i want to make app for apple but i not sure what i should start with c++ or C so i can learn c object programming?i hope some one can help me out.:)
Just learn Objective-C with Cocoa.
If you want to learn Objective C, start with C.

I would also recommend looking at Big Nerd Ranch books
Thanks i start with C book then.Thanks for the help:)
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