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Computer science
Computer science
(sometimes called computation science or computing science, but not to be confused with computational science or software engineering) is the study of processes that interact with data and that can be represented as data in the form of programs. It enables the use of algorithms to manipulate, store, and communicate digital information. A computer scientist studies the theory of computation and the practice of designing software systems.[1] Its fields can be divided into theoretical and practical disciplines. Computational complexity theory
Computational complexity theory
is highly abstract, while computer graphics emphasizes real-world applications. Programming language theory considers approaches to the description of computational processes, while computer programming itself involves the use of programming languages and complex systems. Human–computer interaction considers the challenges in making computers useful, usable, and accessible.

.mw-parser-output .toclimit-2 .toclevel-1 ul,.mw-parser-output .toclimit-3 .toclevel-2 ul,.mw-parser-output .toclimit-4 .toclevel-3 ul,.mw-parser-output .toclimit-5 .toclevel-4 ul,.mw-parser-output .toclimit-6 .toclevel-5 ul,.mw-parser-output .toclimit-7 .toclevel-6 ul display:none Contents

1 History

1.1 Contributions

2 Etymology 3 Philosophy 4 Fields

4.1 Theoretical computer science

4.1.1 Data
Data
structures and algorithms 4.1.2 Theory of computation 4.1.3 Information and coding theory 4.1.4 Programming language
Programming language
theory 4.1.5 Formal methods

4.2 Computer systems

4.2.1 Computer architecture
Computer architecture
and computer engineering 4.2.2 Computer performance analysis 4.2.3 Concurrent, parallel and distributed systems 4.2.4 Computer networks 4.2.5 Computer security
Computer security
and cryptography 4.2.6 Databases

4.3 Computer applications

4.3.1 Computer graphics
Computer graphics
and visualization 4.3.2 Human–computer interaction 4.3.3 Scientific computing 4.3.4 Artificial intelligence

4.4 Software
Software
engineering

5 Discoveries 6 Programming paradigms 7 Academia 8 Education

8.1 Challenges

9 See also 10 Notes 11 References 12 Further reading

12.1 Overview 12.2 Selected literature 12.3 Articles 12.4 Curriculum and classification

13 External links

13.1 Bibliography and academic search engines 13.2 Professional organizations 13.3 Misc

History[edit] Main article: History of computer science History of computing Hardware Hardware before 1960 Hardware 1960s to present

Software Software Unix Free software and open-source software

Computer science Artificial intelligence Compiler construction Computer science Operating systems Programming languages Prominent pioneers Software
Software
engineering

Modern concepts General-purpose CPUs Graphical user interface Internet Laptops Personal computers Video games World Wide Web

By country Bulgaria Poland Romania Soviet Bloc Soviet Union Yugoslavia

Timeline of computing before 1950 1950–1979 1980–1989 1990–1999 2000–2009 2010–2019 more timelines ...

Glossary of computer science Categoryvte Charles Babbage, sometimes referred to as the "father of computing".[2] Ada Lovelace
Ada Lovelace
is often credited with publishing the first algorithm intended for processing on a computer.[3] The earliest foundations of what would become computer science predate the invention of the modern digital computer. Machines for calculating fixed numerical tasks such as the abacus have existed since antiquity, aiding in computations such as multiplication and division. Algorithms for performing computations have existed since antiquity, even before the development of sophisticated computing equipment. Wilhelm Schickard
Wilhelm Schickard
designed and constructed the first working mechanical calculator in 1623.[4] In 1673, Gottfried Leibniz demonstrated a digital mechanical calculator, called the Stepped Reckoner.[5] He may be considered the first computer scientist and information theorist, for, among other reasons, documenting the binary number system. In 1820, Thomas de Colmar launched the mechanical calculator industry[note 1] when he released his simplified arithmometer, which was the first calculating machine strong enough and reliable enough to be used daily in an office environment. Charles Babbage
Charles Babbage
started the design of the first automatic mechanical calculator, his Difference Engine, in 1822, which eventually gave him the idea of the first programmable mechanical calculator, his Analytical Engine.[6] He started developing this machine in 1834, and "in less than two years, he had sketched out many of the salient features of the modern computer".[7] "A crucial step was the adoption of a punched card system derived from the Jacquard loom"[7] making it infinitely programmable.[note 2] In 1843, during the translation of a French article on the Analytical Engine, Ada Lovelace
Ada Lovelace
wrote, in one of the many notes she included, an algorithm to compute the Bernoulli numbers, which is considered to be the first published algorithm ever specifically tailored for implementation on a computer.[8] Around 1885, Herman Hollerith
Herman Hollerith
invented the tabulator, which used punched cards to process statistical information; eventually his company became part of IBM. Following Babbage, although unaware of his earlier work, Percy Ludgate in 1909 published [9] the 2nd of the only two designs for mechanical analytical engines in history. In 1937, one hundred years after Babbage's impossible dream, Howard Aiken convinced IBM, which was making all kinds of punched card equipment and was also in the calculator business[10] to develop his giant programmable calculator, the ASCC/Harvard Mark I, based on Babbage's Analytical Engine, which itself used cards and a central computing unit. When the machine was finished, some hailed it as "Babbage's dream come true".[11] During the 1940s, as new and more powerful computing machines such as the Atanasoff–Berry computer
Atanasoff–Berry computer
and ENIAC
ENIAC
were developed, the term computer came to refer to the machines rather than their human predecessors.[12] As it became clear that computers could be used for more than just mathematical calculations, the field of computer science broadened to study computation in general. In 1945, IBM
IBM
founded the Watson Scientific Computing
Computing
Laboratory at Columbia University in New York City. The renovated fraternity house on Manhattan's West Side was IBM's first laboratory devoted to pure science. The lab is the forerunner of IBM's Research Division, which today operates research facilities around the world.[13] Ultimately, the close relationship between IBM
IBM
and the university was instrumental in the emergence of a new scientific discipline, with Columbia offering one of the first academic-credit courses in computer science in 1946.[14] Computer science
Computer science
began to be established as a distinct academic discipline in the 1950s and early 1960s.[15][16] The world's first computer science degree program, the Cambridge Diploma in Computer Science, began at the University of Cambridge
University of Cambridge
Computer Laboratory in 1953. The first computer science department in the United States was formed at Purdue University in 1962.[17] Since practical computers became available, many applications of computing have become distinct areas of study in their own rights. Although many initially believed it was impossible that computers themselves could actually be a scientific field of study, in the late fifties it gradually became accepted among the greater academic population.[18][19] It is the now well-known IBM
IBM
brand that formed part of the computer science revolution during this time. IBM
IBM
(short for International Business Machines) released the IBM 704[20] and later the IBM
IBM
709[21] computers, which were widely used during the exploration period of such devices. "Still, working with the IBM
IBM
[computer] was frustrating […] if you had misplaced as much as one letter in one instruction, the program would crash, and you would have to start the whole process over again".[18] During the late 1950s, the computer science discipline was very much in its developmental stages, and such issues were commonplace.[19] Time has seen significant improvements in the usability and effectiveness of computing technology.[22] Modern society has seen a significant shift in the users of computer technology, from usage only by experts and professionals, to a near-ubiquitous user base. Initially, computers were quite costly, and some degree of humanitarian aid was needed for efficient use—in part from professional computer operators. As computer adoption became more widespread and affordable, less human assistance was needed for common usage.

See also: History of computing
History of computing
and History of informatics Contributions[edit] The German military used the Enigma machine
Enigma machine
(shown here) during World War II
World War II
for communications they wanted kept secret. The large-scale decryption of Enigma traffic at Bletchley Park
Bletchley Park
was an important factor that contributed to Allied victory in WWII.[23] Despite its short history as a formal academic discipline, computer science has made a number of fundamental contributions to science and society—in fact, along with electronics, it is a founding science of the current epoch of human history called the Information Age
Information Age
and a driver of the information revolution, seen as the third major leap in human technological progress after the Industrial Revolution (1750–1850 CE) and the Agricultural Revolution (8000–5000 BCE). These contributions include:

The start of the "Digital Revolution", which includes the current Information Age
Information Age
and the Internet.[24] A formal definition of computation and computability, and proof that there are computationally unsolvable and intractable problems.[25] The concept of a programming language, a tool for the precise expression of methodological information at various levels of abstraction.[26] In cryptography, breaking the Enigma code was an important factor contributing to the Allied victory in World War II.[23] Scientific computing
Scientific computing
enabled practical evaluation of processes and situations of great complexity, as well as experimentation entirely by software. It also enabled advanced study of the mind, and mapping of the human genome became possible with the Human Genome Project.[24] Distributed computing
Distributed computing
projects such as Folding@home
Folding@home
explore protein folding. Algorithmic trading
Algorithmic trading
has increased the efficiency and liquidity of financial markets by using artificial intelligence, machine learning, and other statistical and numerical techniques on a large scale.[27] High frequency algorithmic trading can also exacerbate volatility.[28] Computer graphics
Computer graphics
and computer-generated imagery have become ubiquitous in modern entertainment, particularly in television, cinema, advertising, animation and video games. Even films that feature no explicit CGI are usually "filmed" now on digital cameras, or edited or post-processed using a digital video editor.[29][30] Simulation
Simulation
of various processes, including computational fluid dynamics, physical, electrical, and electronic systems and circuits, as well as societies and social situations (notably war games) along with their habitats, among many others. Modern computers enable optimization of such designs as complete aircraft. Notable in electrical and electronic circuit design are SPICE,[31] as well as software for physical realization of new (or modified) designs. The latter includes essential design software for integrated circuits.[citation needed] Artificial intelligence
Artificial intelligence
is becoming increasingly important as it gets more efficient and complex. There are many applications of AI, some of which can be seen at home, such as robotic vacuum cleaners. It is also present in video games and on the modern battlefield in drones, anti-missile systems, and squad support robots.[32] Human–computer interaction
Human–computer interaction
combines novel algorithms with design strategies that enable rapid human performance, low error rates, ease in learning, and high satisfaction. Researchers use ethnographic observation and automated data collection to understand user needs, then conduct usability tests to refine designs. Key innovations include the direct manipulation, selectable web links, touchscreen designs, mobile applications, and virtual reality. Etymology[edit] See also: Informatics § Etymology Although first proposed in 1956,[19] the term "computer science" appears in a 1959 article in Communications of the ACM,[33] in which Louis Fein argues for the creation of a Graduate School in Computer Sciences analogous to the creation of Harvard Business School in 1921,[34] justifying the name by arguing that, like management science, the subject is applied and interdisciplinary in nature, while having the characteristics typical of an academic discipline.[33] His efforts, and those of others such as numerical analyst George Forsythe, were rewarded: universities went on to create such departments, starting with Purdue in 1962.[35] Despite its name, a significant amount of computer science does not involve the study of computers themselves. Because of this, several alternative names have been proposed.[36] Certain departments of major universities prefer the term computing science, to emphasize precisely that difference. Danish scientist Peter Naur
Peter Naur
suggested the term datalogy,[37] to reflect the fact that the scientific discipline revolves around data and data treatment, while not necessarily involving computers. The first scientific institution to use the term was the Department of Datalogy at the University of Copenhagen, founded in 1969, with Peter Naur
Peter Naur
being the first professor in datalogy. The term is used mainly in the Scandinavian countries. An alternative term, also proposed by Naur, is data science; this is now used for a multi-disciplinary field of data analysis, including statistics and databases. Also, in the early days of computing, a number of terms for the practitioners of the field of computing were suggested in the Communications of the ACM—turingineer, turologist, flow-charts-man, applied meta-mathematician, and applied epistemologist.[38] Three months later in the same journal, comptologist was suggested, followed next year by hypologist.[39] The term computics has also been suggested.[40] In Europe, terms derived from contracted translations of the expression "automatic information" (e.g. "informazione automatica" in Italian) or "information and mathematics" are often used, e.g. informatique (French), Informatik (German), informatica (Italian, Dutch), informática (Spanish, Portuguese), informatika ( Slavic languages
Slavic languages
and Hungarian) or pliroforiki (πληροφορική, which means informatics) in Greek. Similar words have also been adopted in the UK (as in the School of Informatics of the University of Edinburgh).[41] "In the U.S., however, informatics is linked with applied computing, or computing in the context of another domain."[42] A folkloric quotation, often attributed to—but almost certainly not first formulated by—Edsger Dijkstra, states that "computer science is no more about computers than astronomy is about telescopes."[note 3] The design and deployment of computers and computer systems is generally considered the province of disciplines other than computer science. For example, the study of computer hardware is usually considered part of computer engineering, while the study of commercial computer systems and their deployment is often called information technology or information systems. However, there has been much cross-fertilization of ideas between the various computer-related disciplines. Computer science
Computer science
research also often intersects other disciplines, such as philosophy, cognitive science, linguistics, mathematics, physics, biology, statistics, and logic. Computer science
Computer science
is considered by some to have a much closer relationship with mathematics than many scientific disciplines, with some observers saying that computing is a mathematical science.[15] Early computer science was strongly influenced by the work of mathematicians such as Kurt Gödel, Alan Turing, Rózsa Péter and Alonzo Church
Alonzo Church
and there continues to be a useful interchange of ideas between the two fields in areas such as mathematical logic, category theory, domain theory, and algebra.[19] The relationship between Computer Science
Science
and Software
Software
Engineering is a contentious issue, which is further muddied by disputes over what the term " Software
Software
Engineering" means, and how computer science is defined.[43] David Parnas, taking a cue from the relationship between other engineering and science disciplines, has claimed that the principal focus of computer science is studying the properties of computation in general, while the principal focus of software engineering is the design of specific computations to achieve practical goals, making the two separate but complementary disciplines.[44] The academic, political, and funding aspects of computer science tend to depend on whether a department formed with a mathematical emphasis or with an engineering emphasis. Computer science
Computer science
departments with a mathematics emphasis and with a numerical orientation consider alignment with computational science. Both types of departments tend to make efforts to bridge the field educationally if not across all research.

Philosophy[edit] Main article: Philosophy of computer science A number of computer scientists have argued for the distinction of three separate paradigms in computer science. Peter Wegner argued that those paradigms are science, technology, and mathematics.[45] Peter Denning's working group argued that they are theory, abstraction (modeling), and design.[46] Amnon H. Eden described them as the "rationalist paradigm" (which treats computer science as a branch of mathematics, which is prevalent in theoretical computer science, and mainly employs deductive reasoning), the "technocratic paradigm" (which might be found in engineering approaches, most prominently in software engineering), and the "scientific paradigm" (which approaches computer-related artifacts from the empirical perspective of natural sciences, identifiable in some branches of artificial intelligence).[47]

Fields[edit] .mw-parser-output .templatequote overflow:hidden;margin:1em 0;padding:0 40px .mw-parser-output .templatequote .templatequotecite line-height:1.5em;text-align:left;padding-left:1.6em;margin-top:0 Computer science
Computer science
is no more about computers than astronomy is about telescopes.— Michael Fellows

Further information: Outline of computer science As a discipline, computer science spans a range of topics from theoretical studies of algorithms and the limits of computation to the practical issues of implementing computing systems in hardware and software.[48][49] CSAB, formerly called Computing
Computing
Sciences Accreditation Board—which is made up of representatives of the Association for Computing Machinery (ACM), and the IEEE Computer Society
IEEE Computer Society
(IEEE CS)[50]—identifies four areas that it considers crucial to the discipline of computer science: theory of computation, algorithms and data structures, programming methodology and languages, and computer elements and architecture. In addition to these four areas, CSAB also identifies fields such as software engineering, artificial intelligence, computer networking and communication, database systems, parallel computation, distributed computation, human–computer interaction, computer graphics, operating systems, and numerical and symbolic computation as being important areas of computer science.[48]

Theoretical computer science[edit] Main article: Theoretical computer science Theoretical Computer Science
Science
is mathematical and abstract in spirit, but it derives its motivation from practical and everyday computation. Its aim is to understand the nature of computation and, as a consequence of this understanding, provide more efficient methodologies. All studies related to mathematical, logic and formal concepts and methods could be considered as theoretical computer science, provided that the motivation is clearly drawn from the field of computing.

Data
Data
structures and algorithms[edit] Main articles: Data
Data
structure and Algorithm Data
Data
structures and algorithms are the study of commonly used computational methods and their computational efficiency.

O(n2)

Analysis of algorithms

Algorithms

Data
Data
structures

Combinatorial optimization

Computational geometry

Theory of computation[edit] Main article: Theory of computation According to Peter Denning, the fundamental question underlying computer science is, "What can be (efficiently) automated?"[15] Theory of computation
Theory of computation
is focused on answering fundamental questions about what can be computed and what amount of resources are required to perform those computations. In an effort to answer the first question, computability theory examines which computational problems are solvable on various theoretical models of computation. The second question is addressed by computational complexity theory, which studies the time and space costs associated with different approaches to solving a multitude of computational problems. The famous P = NP? problem, one of the Millennium Prize Problems,[51] is an open problem in the theory of computation.

P = NP?

GNITIRW-TERCES

Automata theory

Computability theory

Computational complexity theory

Cryptography

Quantum computing theory

Information and coding theory[edit] Main articles: Information theory
Information theory
and Coding theory Information theory
Information theory
is related to the quantification of information. This was developed by Claude Shannon
Claude Shannon
to find fundamental limits on signal processing operations such as compressing data and on reliably storing and communicating data.[52] Coding theory
Coding theory
is the study of the properties of codes (systems for converting information from one form to another) and their fitness for a specific application. Codes are used for data compression, cryptography, error detection and correction, and more recently also for network coding. Codes are studied for the purpose of designing efficient and reliable data transmission methods. [53]

Programming language
Programming language
theory[edit] Main article: Programming language
Programming language
theory Programming language theory
Programming language theory
is a branch of computer science that deals with the design, implementation, analysis, characterization, and classification of programming languages and their individual features. It falls within the discipline of computer science, both depending on and affecting mathematics, software engineering, and linguistics. It is an active research area, with numerous dedicated academic journals.

Γ ⊢ x :

Int

displaystyle Gamma vdash x: text Int

Type theory

Compiler design

Programming languages

Formal methods[edit] Main article: Formal methods Formal methods are a particular kind of mathematically based technique for the specification, development and verification of software and hardware systems.[54] The use of formal methods for software and hardware design is motivated by the expectation that, as in other engineering disciplines, performing appropriate mathematical analysis can contribute to the reliability and robustness of a design. They form an important theoretical underpinning for software engineering, especially where safety or security is involved. Formal methods are a useful adjunct to software testing since they help avoid errors and can also give a framework for testing. For industrial use, tool support is required. However, the high cost of using formal methods means that they are usually only used in the development of high-integrity and life-critical systems, where safety or security is of utmost importance. Formal methods are best described as the application of a fairly broad variety of theoretical computer science fundamentals, in particular logic calculi, formal languages, automata theory, and program semantics, but also type systems and algebraic data types to problems in software and hardware specification and verification.

Computer systems[edit] Computer architecture
Computer architecture
and computer engineering[edit] Main articles: Computer architecture
Computer architecture
and Computer engineering Computer architecture, or digital computer organization, is the conceptual design and fundamental operational structure of a computer system. It focuses largely on the way by which the central processing unit performs internally and accesses addresses in memory.[55] The field often involves disciplines of computer engineering and electrical engineering, selecting and interconnecting hardware components to create computers that meet functional, performance, and cost goals.

Digital logic

Microarchitecture

Multiprocessing

Ubiquitous
Ubiquitous
computing

Systems architecture

Operating systems

Computer performance analysis[edit] Main articles: Computer performance and Benchmark (computing) Computer performance analysis is the study of work flowing through computers with the general goals of improving throughput, controlling response time, using resources efficiently, eliminating bottlenecks, and predicting performance under anticipated peak loads.[56] Benchmarks are used to compare the performance of systems carrying different chips and/or system architectures.[57]

Concurrent, parallel and distributed systems[edit] Main articles: Concurrency (computer science)
Concurrency (computer science)
and Distributed computing Concurrency is a property of systems in which several computations are executing simultaneously, and potentially interacting with each other.[58] A number of mathematical models have been developed for general concurrent computation including Petri nets, process calculi and the Parallel Random Access Machine model.[59] When multiple computers are connected in a network while using concurrency, this is known as a distributed system. Computers within that distributed system have their own private memory, and information can be exchanged to achieve common goals.[60]

Computer networks[edit] Main article: Computer network This branch of computer science aims to manage networks between computers worldwide.

Computer security
Computer security
and cryptography[edit] Main articles: Computer security
Computer security
and Cryptography Computer security
Computer security
is a branch of computer technology with an objective of protecting information from unauthorized access, disruption, or modification while maintaining the accessibility and usability of the system for its intended users. Cryptography
Cryptography
is the practice and study of hiding (encryption) and therefore deciphering (decryption) information. Modern cryptography is largely related to computer science, for many encryption and decryption algorithms are based on their computational complexity.

Databases[edit] Main article: Database This article is missing information about a structured set of data held in a computer, especially one that is accessible in various ways.. Please expand the article to include this information. Further details may exist on the talk page. (September 2018) A database is intended to organize, store, and retrieve large amounts of data easily. Digital databases are managed using database management systems to store, create, maintain, and search data, through database models and query languages.

Computer applications[edit] Computer graphics
Computer graphics
and visualization[edit] Main article: Computer graphics
Computer graphics
(computer science) Computer graphics
Computer graphics
is the study of digital visual contents and involves the synthesis and manipulation of image data. The study is connected to many other fields in computer science, including computer vision, image processing, and computational geometry, and is heavily applied in the fields of special effects and video games.

Human–computer interaction[edit] Main article: Human–computer interaction Research that develops theories, principles, and guidelines for user interface designers, so they can create satisfactory user experiences with desktop, laptop, and mobile devices.

Scientific computing[edit] Scientific computing
Scientific computing
(or computational science) is the field of study concerned with constructing mathematical models and quantitative analysis techniques and using computers to analyze and solve scientific problems. In practical use, it is typically the application of computer simulation and other forms of computation to problems in various scientific disciplines.

Numerical analysis

Computational physics

Computational chemistry

Bioinformatics

Artificial intelligence[edit] Main article: Artificial intelligence Artificial intelligence
Artificial intelligence
(AI) aims to or is required to synthesize goal-orientated processes such as problem-solving, decision-making, environmental adaptation, learning, and communication found in humans and animals. From its origins in cybernetics and in the Dartmouth Conference (1956), artificial intelligence research has been necessarily cross-disciplinary, drawing on areas of expertise such as applied mathematics, symbolic logic, semiotics, electrical engineering, philosophy of mind, neurophysiology, and social intelligence. AI is associated in the popular mind with robotic development, but the main field of practical application has been as an embedded component in areas of software development, which require computational understanding. The starting point in the late 1940s was Alan Turing's question "Can computers think?", and the question remains effectively unanswered, although the Turing test
Turing test
is still used to assess computer output on the scale of human intelligence. But the automation of evaluative and predictive tasks has been increasingly successful as a substitute for human monitoring and intervention in domains of computer application involving complex real-world data.

Machine learning

Computer vision

Image processing

Pattern recognition

Data
Data
mining

Evolutionary computation

Knowledge representation and reasoning

Natural language processing

Robotics

Software
Software
engineering[edit] Main article: Software
Software
engineering See also: Computer programming Software engineering is the study of designing, implementing, and modifying software in order to ensure it is of high quality, affordable, maintainable, and fast to build. It is a systematic approach to software design, involving the application of engineering practices to software. Software engineering deals with the organizing and analyzing of software—it doesn't just deal with the creation or manufacture of new software, but its internal maintenance and arrangement.

Discoveries[edit] The philosopher of computing Bill Rapaport noted three Great Insights of Computer Science:[61]

Gottfried Wilhelm Leibniz's, George Boole's, Alan Turing's, Claude Shannon's, and Samuel Morse's insight: there are only two objects that a computer has to deal with in order to represent "anything".[note 4] All the information about any computable problem can be represented using only 0 and 1 (or any other bistable pair that can flip-flop between two easily distinguishable states, such as "on/off", "magnetized/de-magnetized", "high-voltage/low-voltage", etc.). See also: Digital physics Alan Turing's insight: there are only five actions that a computer has to perform in order to do "anything". Every algorithm can be expressed in a language for a computer consisting of only five basic instructions: move left one location; move right one location; read symbol at current location; print 0 at current location; print 1 at current location. See also: Turing machine Corrado Böhm and Giuseppe Jacopini's insight: there are only three ways of combining these actions (into more complex ones) that are needed in order for a computer to do "anything". Only three rules are needed to combine any set of basic instructions into more complex ones: sequence: first do this, then do that; selection: IF such-and-such is the case, THEN do this, ELSE do that; repetition: WHILE such-and-such is the case DO this. Note that the three rules of Boehm's and Jacopini's insight can be further simplified with the use of goto (which means it is more elementary than structured programming). See also: Elementary function arithmetic § Friedman's grand conjecture Programming paradigms[edit] Main article: Programming paradigm Programming languages can be used to accomplish different tasks in different ways. Common programming paradigms include:

Functional programming, a style of building the structure and elements of computer programs that treats computation as the evaluation of mathematical functions and avoids state and mutable data. It is a declarative programming paradigm, which means programming is done with expressions or declarations instead of statements. Imperative programming, a programming paradigm that uses statements that change a program's state. In much the same way that the imperative mood in natural languages expresses commands, an imperative program consists of commands for the computer to perform. Imperative programming focuses on describing how a program operates. Object-oriented programming, a programming paradigm based on the concept of "objects", which may contain data, in the form of fields, often known as attributes; and code, in the form of procedures, often known as methods. A feature of objects is that an object's procedures can access and often modify the data fields of the object with which they are associated. Thus Object-oriented computer programs are made out of objects that interact with one another. Many languages offer support for multiple paradigms, making the distinction more a matter of style than of technical capabilities.[62]

Academia[edit] Further information: List of computer science conferences
List of computer science conferences
and Category: Computer science
Computer science
journals Conferences are important events for computer science research. During these conferences, researchers from the public and private sectors present their recent work and meet. Unlike in most other academic fields, in computer science, the prestige of conference papers is greater than that of journal publications.[63][64] One proposed explanation for this is the quick development of this relatively new field requires rapid review and distribution of results, a task better handled by conferences than by journals.[65]

Education[edit] Computer Science, known by its near synonyms, Computing, Computer Studies, Information Technology (IT) and Information and Computing Technology (ICT), has been taught in UK schools since the days of batch processing, mark sensitive cards and paper tape but usually to a select few students.[66] In 1981, the BBC produced a micro-computer and classroom network and Computer Studies became common for GCE O level
O level
students (11–16-year-old), and Computer Science
Science
to A level
A level
students. Its importance was recognised, and it became a compulsory part of the National Curriculum, for Key Stage 3 & 4. In September 2014 it became an entitlement for all 7,000,000 pupils over the age of 4.[67] In the US, with 14,000 school districts deciding the curriculum, provision was fractured.[68] According to a 2010 report by the Association for Computing
Computing
Machinery (ACM) and Computer Science Teachers Association (CSTA), only 14 out of 50 states have adopted significant education standards for high school computer science.[69] Institute of Electrical and Electronics
Electronics
Engineers (IEEE) produces over 30% of the world's literature in the electrical and electronics engineering and computer science fields, publishing well over 100 peer-reviewed journals. Israel, New Zealand, and South Korea have included computer science in their national secondary education curricula,[70][71] and several others are following.[72]

Challenges[edit] In many countries, there is a significant gender gap in computer science education. In 2012, only 20 percent of computer science degrees in the United States were awarded to women.[73] The gender gap is also a problem in other western countries.[74] The gap is smaller, or nonexistent, in some parts of the world. In 2011, women earned half of the computer science degrees in Malaysia.[75] In 2001, 55 percent of computer science graduates in Guyana
Guyana
were women.[74]

See also[edit] Main articles: Glossary of computer science and Outline of computer science

Computer science
Computer science
portal

Information technology List of computer scientists List of important publications in computer science List of pioneers in computer science List of unsolved problems in computer science List of terms relating to algorithms and data structures Software
Software
engineering Computer science
Computer science
– book

Notes[edit]

^ In 1851

^ "The introduction of punched cards into the new engine was important not only as a more convenient form of control than the drums, or because programs could now be of unlimited extent, and could be stored and repeated without the danger of introducing errors in setting the machine by hand; it was important also because it served to crystallize Babbage's feeling that he had invented something really new, something much more than a sophisticated calculating machine." Bruce Collier, 1970

^ See the entry "Computer science" on Wikiquote for the history of this quotation.

^ The word "anything" is written in quotation marks because there are things that computers cannot do. One example is: to answer the question if an arbitrary given computer program will eventually finish or run forever (the Halting problem).

References[edit]

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Further reading[edit] .mw-parser-output .refbegin font-size:90%;margin-bottom:0.5em .mw-parser-output .refbegin-hanging-indents>ul list-style-type:none;margin-left:0 .mw-parser-output .refbegin-hanging-indents>ul>li,.mw-parser-output .refbegin-hanging-indents>dl>dd margin-left:0;padding-left:3.2em;text-indent:-3.2em;list-style:none .mw-parser-output .refbegin-100 font-size:100% Overview[edit] Tucker, Allen B. (2004). Computer Science
Science
Handbook (2nd ed.). Chapman and Hall/CRC. ISBN 978-1-58488-360-9. "Within more than 70 chapters, every one new or significantly revised, one can find any kind of information and references about computer science one can imagine. […] all in all, there is absolute nothing about Computer Science
Science
that can not be found in the 2.5 kilogram-encyclopaedia with its 110 survey articles […]." (Christoph Meinel, Zentralblatt MATH) van Leeuwen, Jan (1994). Handbook of Theoretical Computer Science. The MIT Press. ISBN 978-0-262-72020-5. "[…] this set is the most unique and possibly the most useful to the [theoretical computer science] community, in support both of teaching and research […]. The books can be used by anyone wanting simply to gain an understanding of one of these areas, or by someone desiring to be in research in a topic, or by instructors wishing to find timely information on a subject they are teaching outside their major areas of expertise." (Rocky Ross, SIGACT News) Ralston, Anthony; Reilly, Edwin D.; Hemmendinger, David (2000). Encyclopedia of Computer Science
Science
(4th ed.). Grove's Dictionaries. ISBN 978-1-56159-248-7. "Since 1976, this has been the definitive reference work on computer, computing, and computer science. […] Alphabetically arranged and classified into broad subject areas, the entries cover hardware, computer systems, information and data, software, the mathematics of computing, theory of computation, methodologies, applications, and computing milieu. The editors have done a commendable job of blending historical perspective and practical reference information. The encyclopedia remains essential for most public and academic library reference collections." (Joe Accardin, Northeastern Illinois Univ., Chicago) Edwin D. Reilly (2003). Milestones in Computer Science
Science
and Information Technology. Greenwood Publishing Group. ISBN 978-1-57356-521-9. Selected literature[edit] Knuth, Donald E. (1996). Selected Papers on Computer Science. CSLI Publications, Cambridge University Press. Collier, Bruce (1990). The little engine that could've: The calculating machines of Charles Babbage. Garland Publishing Inc. ISBN 978-0-8240-0043-1. Cohen, Bernard (2000). Howard Aiken, Portrait of a computer pioneer. The MIT press. ISBN 978-0-262-53179-5. Tedre, Matti (2014). The Science
Science
of Computing: Shaping a Discipline. CRC Press, Taylor & Francis. Randell, Brian (1973). The origins of Digital computers, Selected Papers. Springer-Verlag. ISBN 978-3-540-06169-4. "Covering a period from 1966 to 1993, its interest lies not only in the content of each of these papers – still timely today – but also in their being put together so that ideas expressed at different times complement each other nicely." (N. Bernard, Zentralblatt MATH) Articles[edit] Peter J. Denning. Is computer science science?, Communications of the ACM, April 2005. Peter J. Denning, Great principles in computing curricula, Technical Symposium on Computer Science
Science
Education, 2004. Research evaluation for computer science, Informatics Europe report. Shorter journal version: Bertrand Meyer, Christine Choppy, Jan van Leeuwen and Jorgen Staunstrup, Research evaluation for computer science, in Communications of the ACM, vol. 52, no. 4, pp. 31–34, April 2009. Curriculum and classification[edit] Association for Computing
Computing
Machinery. 1998 ACM Computing
Computing
Classification System. 1998. Joint Task Force of Association for Computing
Computing
Machinery (ACM), Association for Information Systems
Association for Information Systems
(AIS) and IEEE Computer Society (IEEE CS). Computing
Computing
Curricula 2005: The Overview Report. September 30, 2005. Norman Gibbs, Allen Tucker. "A model curriculum for a liberal arts degree in computer science". Communications of the ACM, Volume 29 Issue 3, March 1986.

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