If I upgrade my iOS from 5.1 to 6.0 then do I have to upgrade my Xcode also? So my question is all my old Xcode project which I have tried with Xcode 4.3.2 will be still there because I do not want to destroy them.

I have xcode 4.3.2 and  iOS simulator Version 5.1 (272.21). But this course is on iOS 6. If I upgrade my iOS from 5.1 to 6.0 then do I have to upgrade my Xcode also? So my question is all my old Xcode project which I have tried with Xcode 4.3.2 will be still there because I do not want to destroy them.
I have a MacBook Pro (Software Mac OS X Lion 10.7.5 (11G63b). Please let me know about upgrading iOS version so that I will be able to do the class project.

To program for iOS 6, you need iOS 6 SDK. You need to download Xcode 4.5.x. But don't worry. All your previous projects are still alive and you are able to open them in the new Xcode.

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