Objective C - gnustep/wiki GitHub Wiki
Objective-C is a reflective, object-oriented programming language that adds Smalltalk-style messaging to C.
It is a very "thin" layer on top of C, which makes Objective-C a strict superset of C. That means it is possible to compile any C program with an Objective-C compiler -- something that cannot be said of C++ ...
Objective-C derives its syntax from both C and Smalltalk. Most of the syntax (including preprocessing, expressions, function declarations and function calls) is inherited from C, while the syntax for object-oriented features was created to enable Smalltalk-style message passing.
- Objective-C on Wikipedia
- The Objective-C Programming Language
- Object-Oriented Programming and the Objective-C Language
- Objective-C FAQ
- Manual de Objective-C y GNUstep en español