Ipad & Iphone app development

I've been asked to do a report on Ipad / Iphone App development.

Is it the same IDE and source code for iphone3 iphone4 and Ipad1 Ipad2 or do you have to develop separate code for each device?

Who is Participating?
you will use XCode 4 to develop on all devices. There are a couple of things to think about:

- iPhone 3G and bellow are too slow to support several features available on another devices
- iPad 1 doesn't have camera so if your application will use it, you need to make a condition in code

Otherwise if you don't need specific features you code will be same for all devices except GUI, which will differ for iPads and iPhones (due a different screen size)
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