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You can build iPhone applications with Objective-C.

Objective-C is an object-oriented programming language. It was named after the concept of adding objects to the C language.

Objective C was introduced with NeXTSTEP and OPENSTEP, and was considerably extended in application due to its use with the Cocoa libraries under Mac OS X or the GNUstep libraries. However, you can program in Objective-C without these libraries if you wish.

Because not everyone uses OPENSTEP or Mac OS X, we will introduce these library-specific details later.

Familiarity with the C programming language is required, as Objective-C shares a lot with it, hence its name.

Objective-C concepts
- The basic concepts of object-oriented programming in terms of Objective-C terminology.
Getting Started
- Invoking Objective-C compilers
Objective-C syntax
- The basic details of how to write classes in Objective-C. Writing the interface and implementation.
Objective-C in depth
- Objective-C techniques, using the `Object` class, categories, protocols.
Objective-C advanced features
- Advanced Objective-C, selectors, message forwarding, archiving.

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