O

Objective-C – A programming language designed by Tom Love and Brad Cox. It was first released in 1984. It was the primary programming language supported by Apple until the introduction of Swift in 2014. See Swift.

Object orientation – A software engineering paradigm in which concepts are represented as objects.

Object-oriented programming – A paradigm based on a concept where programs are constructed using objects.

Object – A representation used in object orientation that is made up of data in the form of fields (often called attributes or properties) and code in the form of functions (referred to as methods to distinguish them from functions defined outside classes).

Ones' complement – The ones' complement of a binary number is accomplished by inverting all the bits in that number (swapping zeros for ones and vice versa).

Opcode – An abbreviation of operation code, this is a portion of a machine language instruction...