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#REDIRECT [[Modular programming]]
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In [[computer science]], a '''module''' is a software entity that groups a set of (typically [[cohesion (computer science)|cohesive]]) [[subprogram]]s and [[data structure]]s. Modules are units that can be [[compiler|compiled]] separately, which makes them reusable and allows multiple programmers to work on different modules simultaneously. Modules also promote [[modularity (programming)|modularity]] and encapsulation (i.e. [[information hiding]]), both of which can make complex programs easier to understand.
Modules provide a separation between [[interface (computer science)|interface]] and [[implementation]]. A module interface expresses the elements that are provided and required by the module. The elements defined in the interface are visible to other modules. The implementation contains the working code that corresponds to the elements declared in the interface. Languages that explicitly support the module concept include [[Ada programming language|Ada]], [[D programming language|D]], [[F programming language|F]], [[Fortran]], [[Pascal programming language|Pascal]], [[ML programming language|ML]], [[Modula-2]], [[Python programming language|Python]] and [[Ruby programming language|Ruby]].
== Modules and classes ==
The differences between [[class (computer science)|class]]es and modules are:
*Classes can be instantiated to create [[object (computer science)|object]]s,
*Classes can [[inheritance (object-oriented programming)|inherit]] behavior and data from another class,
*[[Polymorphism (computer science)|Polymorphism]] allows relationships between class instances to change at run-time, while relations between modules are static.
The similarities between classes and modules are:
*Both can be used to hide abstraction from public view.
*Both can form a hierarchy of modules/classes.
==Module Interconnection Languages (MILs)==
'''Module Interconnection Languages''' ('''MILs''') provide formal grammar constructs for deciding the various module interconnection specifications required to assemble a complete software system. MILs enable the separation between programming-in-the-small and programming-in-the-large. Coding a module represents programming in the small, while assembling a system with the help of a MIL represents programming in the large. An example of MIL is MIL-75.
==External links==
{{Wikibookschapter
| book = Ada Programming
| chapter = Packages
| name = Modules
}}
*[http://modules.sourceforge.net/ Environment Modules]
[[Category:Computer programming]]
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