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Objective-C

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Objective-C is an object-oriented programming language that combines C (c) and Smalltalk characteristics (small talk). It is a tight superset of C (all acceptable C code is also good Objective-C code, with the slight distinction that in C, id is a free identifier for user use, but it is a keyword), and it inherits Smalltalk's object-oriented features. All procedural syntax is equal to C, and all object-oriented terminology is a Smalltalk messaging implementation.

Objective-C was developed principally by Brad Cox and Tom Love at their firm Stepstone in the early 1980s. It is presently primarily developed by Apple, Inc. in its current form.

Objective-C is a general-purpose, high-level, object-oriented programming language that extends the C programming language with Smalltalk-style messaging. It is Apple's primary programming language for macOS and iOS and their corresponding APIs, cocoa and cocoa-touch.

C's syntax, primitive types, and flow control instructions are carried over to Objective-C, along with syntax for defining classes and functions. It also has language-level support for object graph management and objects literals and the dynamic type and binding, which deferments many tasks until run time.