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A PDF file is organized using ASCII characters, except for certain elements that may have binary content. The file starts with a header containing a magic number (as a readable string) and the version of the format, for example %PDF-1.7. The format is a subset of a COS ("Carousel" Object Structure) format. [24]
In object-oriented programming, the open–closed principle (OCP) states "software entities (classes, modules, functions, etc.) should be open for extension, but closed for modification"; [1] that is, such an entity can allow its behaviour to be extended without modifying its source code. The name open–closed principle has been used in two ways.
[29] [14] Like SCP's program it was designed to port CP/M-80 application code (in ASM, MAC, RMAC or ACT80 assembly format) to MS-DOS (in a format compatible with ACT86). [29] [15] [30] [31] In ACT80 format it also supported a few Z80 mnemonics. The translation occurred on an instruction-by-instruction basis with some optimization applied to ...
The SCP Foundation [note 3] is a fictional organization featured in stories created by contributors on the SCP Wiki, a wiki-based collaborative writing project. Within the project's shared fictional universe, the SCP Foundation is a secret organization that is responsible for capturing, containing, and studying various paranormal, supernatural, and other mysterious phenomena (known as ...
The meaning of these modifiers may differ from one language to another. A comparison of the keywords, ordered from the most restrictive to the most open, and their meaning in these three languages follows. Their visibility ranges from the same class to the package where the class is defined to a general access permission.
Parameterized classes; Parnas's principles; Partial class; Patterns; Policy-based design; Polymorphic; Primitive data type; private, a way of encapsulation in object-oriented programming; Programming paradigm; protected, a way of encapsulation in object-oriented programming; Protocol; Prototype pattern; Prototype-based programming
Object-oriented programming uses objects, but not all of the associated techniques and structures are supported directly in languages that claim to support OOP. The features listed below are common among languages considered to be strongly class- and object-oriented (or multi-paradigm with OOP support), with notable exceptions mentioned.
In object-oriented programming, a class defines the shared aspects of objects created from the class. The capabilities of a class differ between programming languages , but generally the shared aspects consist of state ( variables ) and behavior ( methods ) that are each either associated with a particular object or with all objects of that class.