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The NDP leader conceded that our health-care ‘system is broken,’ but is intent on replicating the failed approach for providing dental care. We need to establish a national values program that inspires our students by teaching them the core values and principles that define Canada. If it is impossible to render one’s country impervious to the ambitions of bullies, perhaps one has to raise the cost of any aggression to an unacceptable level.

Recorded June 9, Find the best places within Ottawa. From local businesses to food to medical to legal services. National Post readers discuss the performance of Canada’s foreign affairs minister, and other issues of the day. Dear Diary: ‘You parasite! Just because I said some words, suddenly you can take my money? The rules of national competitiveness keep changing.

If the last few years were tough, the future looks even more confusing. Is Canada up to the challenges? The apparent answer is disquieting. The first plausible sign of a more adult direction in public policy leadership for some years is coming from Poilievre.

The battle over Scottish independence continues to be underexamined in the Canadian press, despite the many factors that ought to make the subject one of compelling interest here. The events of this summer offer a spectacle that rhymes closely with Canadian constitutional history. The government, like the prime minister, always thinks that more of itself is what Indigenous Canadians need. Assuming that transgender health care must exist in some form, we should strive to make it as effective and responsible as possible.

Unfortunately, the kind of care provided in recent years has often been irresponsible. The likely Conservative leadership winner should ignore pleas to move to the centre. Foreign affairs is too important a cabinet position to be handled so carelessly.

National Post readers discuss the Conservative leadership debate, and other issues of the day. Ford deserves some credit for trying to tackle long-standing health care deficiencies. Unfortunately, effort isn’t good enough. This website uses cookies to personalize your content including ads , and allows us to analyze our traffic. Read more about cookies here.

By continuing to use our site, you agree to our Terms of Service and Privacy Policy. Search nationalpost. Advertisement 1.

This advertisement has not loaded yet, but your article continues below. NP Comment. Jesse Kline NP Comment.

Adam Zivo NP Comment. Sabrina Maddeaux NP Comment. Randall Denley NP Comment. Latest NP Comment Videos. Up Next. Advertisement 2. Frank Stronach: Canadian values should be incorporated into school curricula We need to establish a national values program that inspires our students by teaching them the core values and principles that define Canada.

Frank Stronach 1 day ago NP Comment. Colby Cosh 1 day ago NP Comment. Jamil Jivani: Corporate Canada should take U. Jamil Jivani 1 day ago NP Comment. Dominic Nicholls: The porcupine theory of Taiwanese defence If it is impossible to render one’s country impervious to the ambitions of bullies, perhaps one has to raise the cost of any aggression to an unacceptable level 25 Comments.

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Conrad Black 4 days ago NP Comment. Colby Cosh: Scottish nationalists turn to constitutional backdoor for independence The battle over Scottish independence continues to be underexamined in the Canadian press, despite the many factors that ought to make the subject one of compelling interest here.

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Letters to the editor: To show or not to show, that is the debate question National Post readers discuss the Conservative leadership debate, and other issues of the day 17 Comments. Letters 5 days ago NP Comment. Randall Denley: Until Doug Ford comes up with real health care plan, he will keep taking blame Ford deserves some credit for trying to tackle long-standing health care deficiencies. Unfortunately, effort isn’t good enough with Video 58 Comments.

Randall Denley 5 days ago NP Comment. The Trudeau Liberals have been overrun by green idealists Comments. Jesse Kline 5 days ago NP Comment. Notice for the Postmedia Network This website uses cookies to personalize your content including ads , and allows us to analyze our traffic.

Up Next. Advertisement 2. Frank Stronach: Canadian values should be incorporated into school curricula We need to establish a national values program that inspires our students by teaching them the core values and principles that define Canada. Frank Stronach 1 day ago NP Comment. Colby Cosh 1 day ago NP Comment. Jamil Jivani: Corporate Canada should take U. Jamil Jivani 1 day ago NP Comment. Dominic Nicholls: The porcupine theory of Taiwanese defence If it is impossible to render one’s country impervious to the ambitions of bullies, perhaps one has to raise the cost of any aggression to an unacceptable level 25 Comments.

Advertisement 4. Conrad Black: Pierre Poilievre the man to raise Canada out of its infantile stupor The first plausible sign of a more adult direction in public policy leadership for some years is coming from Poilievre Comments. Conrad Black 4 days ago NP Comment.

Colby Cosh: Scottish nationalists turn to constitutional backdoor for independence The battle over Scottish independence continues to be underexamined in the Canadian press, despite the many factors that ought to make the subject one of compelling interest here.

Colby Cosh 4 days ago NP Comment. Raymond J. May 13, Retrieved May 13, May 12, Retrieved May 12, Retrieved May 13, — via nytimes. Retrieved May 14, May 26, Retrieved May 26, June 6, Retrieved June 12, Beverly Hills Courier.

June 2, June 4, June 7, June 10, June 11, Retrieved June 11, June 12, Retrieved February 6, June 16, Retrieved June 16, June 20, Retrieved June 20, June 22, Retrieved June 26, June 25, Retrieved July 3, CBS News. June 26, Retrieved June 27, June 27, January 7, Retrieved January 7, Recommendations in Hillary Clinton Email Inquiry”.

The Wall Street Journal. Retrieved August 2, Sporting News. March 8, Retrieved August 22, July 3, Retrieved July 7, July 7, August 7, Retrieved August 1, September 7, July 16, Retrieved July 17, July 17, July 31, Retrieved July 31, July 30, The Baltimore Sun. July 28, August 3, Retrieved August 11, August 2, Retrieved September 26, August 1, The Indian Express. August 22, Retrieved August 23, The Kansas City Star.

Dallas News. Retrieved August 3, Retrieved September 10, November 9, Retrieved September 12, Retrieved September 19, Retrieved September 18, Cloud Times. September 18, Retrieved February 5, September 19, September 22, Retrieved September 22, September 24, Retrieved October 1, September 27, Retrieved September 27, September 28, The Record. September 29, October 1, Retrieved October 3, October 6, Retrieved October 6, October 7, Retrieved October 8, Rolling Stone. October 10, Retrieved October 12, Retrieved October 21, Retrieved October 11, October 16, October 21, October 28, Retrieved November 22, Retrieved October 28, Retrieved November 4, — via nytimes.

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Microsoft office professional 2016 harvey norman free.Course Help Online

A computer is a digital electronic machine that can be programmed to carry out sequences of arithmetic or logical operations computation automatically. Modern computers can perform generic sets of operations known as programs.

These programs enable computers to perform a wide range of tasks. A computer system is a “complete” computer that includes the hardwareoperating system main softwareand peripheral equipment needed and used for “full” operation.

This term may also refer to a group of computers that are linked and function together, such as a computer network or computer cluster. A broad range of industrial and consumer products micrisoft computers as control systems.

Simple special-purpose devices like microwave ovens and remote controls are included, as are factory devices like industrial robots and computer-aided designas well as general-purpose devices like personal computers and mobile devices like smartphones.

Computers power ofrice Internetwhich links billions of other computers and users. Early computers were meant to haarvey used only for calculations.

Simple manual instruments like the abacus have aided people in doing calculations since ancient times. Early in the Industrial Revolutionsome mechanical devices were built to automate long tedious tasks, such as guiding patterns for looms.

More sophisticated electrical узнать больше здесь did specialized analog calculations in the early 20th century. The first digital electronic calculating google play app download windows 10 were developed during World War II. The first semiconductor transistors in the late s were followed by the silicon -based MOSFET MOS transistor and monolithic integrated circuit IC chip technologies in the late s, nogman to the microprocessor and the microcomputer revolution in the s.

The speed, power and versatility of computers have been increasing dramatically ever since then, with transistor counts increasing at a rapid pace as predicted by Moore’s lawleading to the Digital Revolution during the late 20th to early 21st centuries. Conventionally, a modern computer consists of at least one processing elementtypically a central processing unit CPU in the form of a microprocessoralong with some type of computer memorytypically semiconductor memory chips.

The processing element carries out arithmetic and logical operations, and a sequencing and control unit can change the order of operations in response microsoft office professional 2016 harvey norman free stored information.

Peripheral devices include input devices keyboards, mice, joysticketc. Peripheral devices allow information to be retrieved from an microsoft office professional 2016 harvey norman free source and they enable the result of operations to be saved and retrieved. According to the Oxford Pdofessional Dictionarythe first known use of computer was in a book called The Yong Mans Gleanings by the English writer Richard Brathwait : “I haue [ sic ] read the truest computer of Times, and the best Arithmetician that euer [sic] breathed, and he reduceth thy dayes into a pv elite 2017 crack free download number.

The word continued with the same meaning until the middle of the 20th century. During the latter part of this period women were often hired as computers because they could be paid less than their male counterparts.

The Online Etymology Dictionary gives the first attested use of computer in the s, meaning ‘one who calculates’; this is an microsoft office professional 2016 harvey norman free noun from compute v. The Online Etymology Dictionary states that the use of the term to mean ” ‘calculating machine’ of any type is from Devices have been used to aid computation for thousands of years, mostly using one-to-one correspondence with fingers.

The earliest counting device was probably a form of tally stick. Later record keeping aids throughout the Fertile Crescent included calculi clay spheres, cones, etc. The abacus was initially used for arithmetic tasks. The Roman abacus was developed from devices used in Babylonia as early as BC. Since then, many other forms of reckoning boards or tables have been invented. In a medieval European counting housea checkered cloth would be placed on a table, and markers moved around on it according to certain rules, as an aid to calculating sums of money.

The Antikythera mechanism is believed to be the earliest known mechanical analog computeraccording to Derek J. It was discovered in in the Antikythera wreck off the Greek island of Antikytherabetween Kythera and Creteand has been dated to approximately c. Devices of comparable complexity to the Antikythera mechanism would not reappear until the fourteenth century.

Microsoft office professional 2016 harvey norman free mechanical aids to calculation and measurement were constructed for astronomical and navigation use. A combination of the planisphere and dioptrathe astrolabe was effectively an analog computer capable of working out several different kinds of problems in spherical astronomy.

An astrolabe incorporating a mechanical calendar computer [9] [10] and gear -wheels was invented by Abi Bakr of IsfahanPersia in The sectora calculating instrument used for solving problems in proportion, trigonometry, multiplication and division, and for various functions, such as squares and cube roots, was developed in the late 16th century and found application in gunnery, surveying and navigation.

The planimeter was a manual instrument to calculate the area of a closed figure by tracing over it with a mechanical linkage. The slide rule was invented around — by the English clergyman William Oughtredshortly after the publication of the concept professiobal the logarithm.

It is microsoft office professional 2016 harvey norman free hand-operated analog computer for doing multiplication and division. As slide rule development progressed, added scales provided reciprocals, squares and square roots, cubes and cube roots, as well as transcendental functions such as logarithms and exponentials, circular and hyperbolic trigonometry and other functions.

Slide rules with special scales are still used for quick performance of routine calculations, such as the E6B circular slide rule used for time and distance calculations on light aircraft.

Microsoft office professional 2016 harvey norman free the s, Pierre Jaquet-Droza Swiss watchmakerbuilt a mechanical doll automaton that could write holding a quill pen.

By switching the number and order of its internal wheels different letters, and hence different messages, could be produced. In effect, it could be mechanically “programmed” to read microsoft office professional 2016 harvey norman free. In —, mathematician and engineer Giovanni Plana devised a Perpetual Calendar machinewhich, through norkan system of pulleys and cylinders and over, could predict the perpetual calendar for every year from AD 0 that is, 1 BC to ADkeeping track of leap years and varying day length.

The tide-predicting machine invented by the Scottish scientist Sir William Thomson in was of great utility to navigation in shallow waters. It used a system of pulleys and wires to automatically calculate predicted tide levels microsoft office professional 2016 harvey norman free offiec set ,icrosoft at a particular location. The differential analysera mechanical analog computer designed to solve differential equations by integrationused wheel-and-disc mechanisms to perform the integration.

InSir William Thomson had already discussed the possible construction of such calculators, but he had been stymied by the limited output torque of the micrisoft integrators. The torque amplifier was the advance that allowed these machines to work.

Starting in the s, Vannevar Bush and others developed mechanical differential analyzers. Charles Babbagean English mechanical engineer and polymathoriginated the concept of a programmable computer.

Considered the ” father of the computer “, [17] he conceptualized and invented the first mechanical computer in the early 19th century. After working on his revolutionary difference enginedesigned to aid in navigational calculations, microsoft office professional 2016 harvey norman free he realized that a much more general design, an Analytical Enginewas possible.

The input of programs and data was to be provided to the machine via punched cardsa method being used at the time to microsoft office professional 2016 harvey norman free pprofessional looms such as the Jacquard loom. For output, the machine would have a printer, a curve plotter and a bell. The machine would also вот ссылка able to punch numbers по ссылке cards to be read in microsoft office professional 2016 harvey norman free.

The Engine incorporated an arithmetic logic unitcontrol flow in the form of conditional branching and loopsand integrated memorymaking it the first design for a general-purpose computer that could be described in modern terms as Turing-complete. The machine was about a century ahead of its time. All the parts for his machine had to be made by hand — this was a major problem for a device with thousands of parts. Eventually, the project was dissolved with the decision of the British Government to cease funding.

Babbage’s failure to complete the analytical engine can be chiefly attributed to political and financial difficulties as well as his desire to develop an increasingly sophisticated computer and to move ahead faster than anyone else could follow.

Nevertheless, his son, Henry Babbagecompleted a simplified version of the analytical engine’s computing unit the mill in He gave a successful demonstration of its use in computing tables in During the first half of the 20th century, many scientific computing needs were met by increasingly sophisticated harvye computerswhich used a direct mechanical or electrical model of the problem as a basis for computation.

However, these were not programmable and generally lacked the увидеть больше and accuracy of modern digital computers. The differential analysera mechanical analog computer designed to solve differential equations by integration using wheel-and-disc mechanisms, was conceptualized in by James Nnormanthe elder brother of the more famous Sir William Thomson.

The art of mechanical analog computing reached its zenith with the differential analyzerbuilt by H. This built on mkcrosoft mechanical integrators of James Thomson and the torque amplifiers invented by H. A dozen of these devices were built offfice their obsolescence became obvious. By the s, the success of digital electronic computers had spelled the end for most analog computing machines, but analog computers remained in use during the s in some specialized applications such as education slide rule and aircraft control systems.

Bythe United States Navy had developed an electromechanical analog computer small enough to use aboard a submarine. This microsoft office professional 2016 harvey norman free the Torpedo Data Computerwhich used trigonometry to solve the problem of firing a torpedo at a moving target.

During World War II similar devices were developed in other countries as well. Early digital computers were electromechanical ; electric switches drove mechanical relays to perform the calculation. These devices had a low operating speed and were http://replace.me/27895.txt superseded by much faster all-electric computers, originally using vacuum tubes.

The Z2created by German engineer Konrad Zuse inwas micrlsoft of the earliest examples of an electromechanical relay computer. InZuse followed his earlier machine up with the Z3the world’s first working electromechanical programmable microsoft office professional 2016 harvey norman free, fully automatic digital computer. It was quite similar to modern machines in some respects, pioneering numerous harcey such as floating-point numbers.

Rather than the harder-to-implement decimal system used in Charles Babbage ‘s earlier designusing a binary system meant that Zuse’s machines were easier to build and potentially more reliable, given the technologies available at that time. Zuse’s next computer, the Z4became the world’s first commercial computer; after initial delay due to the Second World War, it was completed in and delivered to the ETH Zurich.

Purely electronic circuit elements soon replaced their mechanical and electromechanical equivalents, at the same time that digital calculation replaced analog.

The engineer Tommy Flowersworking at the Post Office Research Station in London in the s, began to explore the possible use of electronics for the telephone exchange. Experimental equipment that he built in went into operation five years later, converting a portion of the telephone exchange network into an electronic data processing system, using thousands of vacuum tubes. The German перейти на страницу machine, Enigmawas first attacked microsoft office professional 2016 harvey norman free the help of the electro-mechanical bombes which were often run by women.

Colossus was adobe muse free download world’s first electronic digital programmable computer. It had paper-tape input and was capable of being configured to perform a variety of boolean logical operations on its data, but it was not Turing-complete.

Colossus Mark I contained 1, thermionic valves tubesbut Mark II with 2, valves, was ofice five times noorman and simpler to operate than Mark I, greatly speeding the decoding process. Like the Colossus, a “program” on the ENIAC was defined by the states of its patch cables and switches, a far cry from the stored program electronic machines that came later. Once a program was written, it had to be mechanically set into professiknal machine with manual resetting of plugs and switches.

It combined the high speed of electronics with the ability to be programmed for many complex problems. It could add or subtract times a second, a thousand times faster than any other machine. It microeoft had microsoft office professional 2016 harvey norman free offce multiply, divide, and square root.

High speed memory was limited to 20 words about 80 bytes. Built under the direction of John Mauchly and J. The machine was huge, weighing 30 tons, using kilowatts of electric power and contained over 18, vacuum tubes, 1, relays, and hundreds of thousands of resistors, capacitors, and inductors. The principle of the modern computer was proposed by Alan Turing in his seminal paper, [42] On Computable Numbers.

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Read unique story pieces & columns written by editors and columnists at National Post. Get in-depth analysis on current news, happenings and headlines. A computer is a digital electronic machine that can be programmed to carry out sequences of arithmetic or logical operations (computation) replace.me computers can perform generic sets of operations known as replace.me programs enable computers to perform a wide range of tasks. A computer system is a “complete” computer that includes the . Copy and paste this code into your website. Your Link .

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It is often divided into system software and application software Computer hardware and software require each other and neither can be realistically used on its own. There are thousands of different programming languages—some intended for general purpose, others useful for only highly specialized applications. The defining feature of modern computers which distinguishes them from all other machines is that they can be programmed.

That is to say that some type of instructions the program can be given to the computer, and it will process them. Modern computers based on the von Neumann architecture often have machine code in the form of an imperative programming language. In practical terms, a computer program may be just a few instructions or extend to many millions of instructions, as do the programs for word processors and web browsers for example.

A typical modern computer can execute billions of instructions per second gigaflops and rarely makes a mistake over many years of operation. Large computer programs consisting of several million instructions may take teams of programmers years to write, and due to the complexity of the task almost certainly contain errors.

This section applies to most common RAM machine —based computers. In most cases, computer instructions are simple: add one number to another, move some data from one location to another, send a message to some external device, etc. These instructions are read from the computer’s memory and are generally carried out executed in the order they were given.

However, there are usually specialized instructions to tell the computer to jump ahead or backwards to some other place in the program and to carry on executing from there. These are called “jump” instructions or branches. Furthermore, jump instructions may be made to happen conditionally so that different sequences of instructions may be used depending on the result of some previous calculation or some external event.

Many computers directly support subroutines by providing a type of jump that “remembers” the location it jumped from and another instruction to return to the instruction following that jump instruction. Program execution might be likened to reading a book. While a person will normally read each word and line in sequence, they may at times jump back to an earlier place in the text or skip sections that are not of interest. Similarly, a computer may sometimes go back and repeat the instructions in some section of the program over and over again until some internal condition is met.

This is called the flow of control within the program and it is what allows the computer to perform tasks repeatedly without human intervention. Comparatively, a person using a pocket calculator can perform a basic arithmetic operation such as adding two numbers with just a few button presses. But to add together all of the numbers from 1 to 1, would take thousands of button presses and a lot of time, with a near certainty of making a mistake.

On the other hand, a computer may be programmed to do this with just a few simple instructions. The following example is written in the MIPS assembly language :. Once told to run this program, the computer will perform the repetitive addition task without further human intervention.

It will almost never make a mistake and a modern PC can complete the task in a fraction of a second. In most computers, individual instructions are stored as machine code with each instruction being given a unique number its operation code or opcode for short.

The command to add two numbers together would have one opcode; the command to multiply them would have a different opcode, and so on. The simplest computers are able to perform any of a handful of different instructions; the more complex computers have several hundred to choose from, each with a unique numerical code.

Since the computer’s memory is able to store numbers, it can also store the instruction codes. This leads to the important fact that entire programs which are just lists of these instructions can be represented as lists of numbers and can themselves be manipulated inside the computer in the same way as numeric data. The fundamental concept of storing programs in the computer’s memory alongside the data they operate on is the crux of the von Neumann, or stored program, architecture.

This is called the Harvard architecture after the Harvard Mark I computer. Modern von Neumann computers display some traits of the Harvard architecture in their designs, such as in CPU caches. While it is possible to write computer programs as long lists of numbers machine language and while this technique was used with many early computers, [h] it is extremely tedious and potentially error-prone to do so in practice, especially for complicated programs.

These mnemonics are collectively known as a computer’s assembly language. Converting programs written in assembly language into something the computer can actually understand machine language is usually done by a computer program called an assembler.

Programming languages provide various ways of specifying programs for computers to run. Unlike natural languages , programming languages are designed to permit no ambiguity and to be concise. They are purely written languages and are often difficult to read aloud. They are generally either translated into machine code by a compiler or an assembler before being run, or translated directly at run time by an interpreter. Sometimes programs are executed by a hybrid method of the two techniques.

Machine languages and the assembly languages that represent them collectively termed low-level programming languages are generally unique to the particular architecture of a computer’s central processing unit CPU.

Although considerably easier than in machine language, writing long programs in assembly language is often difficult and is also error prone. Therefore, most practical programs are written in more abstract high-level programming languages that are able to express the needs of the programmer more conveniently and thereby help reduce programmer error.

High level languages are usually “compiled” into machine language or sometimes into assembly language and then into machine language using another computer program called a compiler. It is therefore often possible to use different compilers to translate the same high level language program into the machine language of many different types of computer. This is part of the means by which software like video games may be made available for different computer architectures such as personal computers and various video game consoles.

Program design of small programs is relatively simple and involves the analysis of the problem, collection of inputs, using the programming constructs within languages, devising or using established procedures and algorithms, providing data for output devices and solutions to the problem as applicable.

As problems become larger and more complex, features such as subprograms, modules, formal documentation, and new paradigms such as object-oriented programming are encountered. Large programs involving thousands of line of code and more require formal software methodologies. The task of developing large software systems presents a significant intellectual challenge.

Producing software with an acceptably high reliability within a predictable schedule and budget has historically been difficult; the academic and professional discipline of software engineering concentrates specifically on this challenge. Errors in computer programs are called ” bugs “. They may be benign and not affect the usefulness of the program, or have only subtle effects. But in some cases, they may cause the program or the entire system to ” hang “, becoming unresponsive to input such as mouse clicks or keystrokes, to completely fail, or to crash.

Bugs are usually not the fault of the computer. Since computers merely execute the instructions they are given, bugs are nearly always the result of programmer error or an oversight made in the program’s design. Computers have been used to coordinate information between multiple locations since the s.

The U. In time, the network spread beyond academic and military institutions and became known as the Internet. The emergence of networking involved a redefinition of the nature and boundaries of the computer.

Computer operating systems and applications were modified to include the ability to define and access the resources of other computers on the network, such as peripheral devices, stored information, and the like, as extensions of the resources of an individual computer. Initially these facilities were available primarily to people working in high-tech environments, but in the s the spread of applications like e-mail and the World Wide Web , combined with the development of cheap, fast networking technologies like Ethernet and ADSL saw computer networking become almost ubiquitous.

In fact, the number of computers that are networked is growing phenomenally. A very large proportion of personal computers regularly connect to the Internet to communicate and receive information. A computer does not need to be electronic , nor even have a processor , nor RAM , nor even a hard disk.

While popular usage of the word “computer” is synonymous with a personal electronic computer, [l] the modern definition of a computer is literally: ” A device that computes , especially a programmable [usually] electronic machine that performs high-speed mathematical or logical operations or that assembles, stores, correlates, or otherwise processes information. There is active research to make computers out of many promising new types of technology, such as optical computers , DNA computers , neural computers , and quantum computers.

Most computers are universal, and are able to calculate any computable function , and are limited only by their memory capacity and operating speed. However different designs of computers can give very different performance for particular problems; for example quantum computers can potentially break some modern encryption algorithms by quantum factoring very quickly.

There are many types of computer architectures :. Of all these abstract machines , a quantum computer holds the most promise for revolutionizing computing. The ability to store and execute lists of instructions called programs makes computers extremely versatile, distinguishing them from calculators.

The Church—Turing thesis is a mathematical statement of this versatility: any computer with a minimum capability being Turing-complete is, in principle, capable of performing the same tasks that any other computer can perform. Therefore, any type of computer netbook , supercomputer , cellular automaton , etc.

A computer will solve problems in exactly the way it is programmed to, without regard to efficiency, alternative solutions, possible shortcuts, or possible errors in the code. Computer programs that learn and adapt are part of the emerging field of artificial intelligence and machine learning.

Artificial intelligence based products generally fall into two major categories: rule-based systems and pattern recognition systems. Rule-based systems attempt to represent the rules used by human experts and tend to be expensive to develop. Pattern-based systems use data about a problem to generate conclusions.

Examples of pattern-based systems include voice recognition , font recognition, translation and the emerging field of on-line marketing. As the use of computers has spread throughout society, there are an increasing number of careers involving computers. The need for computers to work well together and to be able to exchange information has spawned the need for many standards organizations, clubs and societies of both a formal and informal nature.

From Wikipedia, the free encyclopedia. Automatic general-purpose device for performing arithmetic or logical operations. For other uses, see Computer disambiguation. Computers and computing devices from different eras. Main articles: History of computing and History of computing hardware.

For a chronological guide, see Timeline of computing. Main article: Analog computer. Main article: Stored-program computer. Main articles: Transistor and History of the transistor. Main articles: Integrated circuit and Invention of the integrated circuit. Further information: Planar process and Microprocessor. See also: Classes of computers. Main articles: Computer hardware , Personal computer hardware , Central processing unit , and Microprocessor.

Main article: History of computing hardware. Main articles: CPU design and Control unit. Main articles: Central processing unit and Microprocessor. Main article: Arithmetic logic unit. Main articles: Computer memory and Computer data storage. Main article: Computer multitasking. Main article: Multiprocessing. Main article: Software.

Main articles: Computer program and Computer programming. Main article: Programming language. Main article: Low-level programming language. Main article: High-level programming language. This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. July Learn how and when to remove this template message. Main article: Software bug.

Main articles: Computer networking and Internet. Main article: Human computer. See also: Harvard Computers. Glossary of computers Computability theory Computer security Glossary of computer hardware terms History of computer science List of computer term etymologies List of fictional computers List of pioneers in computer science Pulse computation TOP list of most powerful computers Unconventional computing. The containers thus served as something of a bill of lading or an accounts book.

In order to avoid breaking open the containers, first, clay impressions of the tokens were placed on the outside of the containers, for the count; the shapes of the impressions were abstracted into stylized marks; finally, the abstract marks were systematically used as numerals; these numerals were finally formalized as numbers. Eventually the marks on the outside of the containers were all that were needed to convey the count, and the clay containers evolved into clay tablets with marks for the count.

Schmandt-Besserat estimates it took years. All of the architectures listed in this table, except for Alpha, existed in bit forms before their bit incarnations were introduced. Although the control unit is solely responsible for instruction interpretation in most modern computers, this is not always the case. Some computers have instructions that are partially interpreted by the control unit with further interpretation performed by another device.

For example, EDVAC , one of the earliest stored-program computers, used a central control unit that interpreted only four instructions. All of the arithmetic-related instructions were passed on to its arithmetic unit and further decoded there. These so-called computer clusters can often provide supercomputer performance at a much lower cost than customized designs.

While custom architectures are still used for most of the most powerful supercomputers, there has been a proliferation of cluster computers in recent years.

However, this method was usually used only as part of the booting process. Most modern computers boot entirely automatically by reading a boot program from some non-volatile memory. An x compatible microprocessor like the AMD Athlon 64 is able to run most of the same programs that an Intel Core 2 microprocessor can, as well as programs designed for earlier microprocessors like the Intel Pentiums and Intel This contrasts with very early commercial computers, which were often one-of-a-kind and totally incompatible with other computers.

Interpreted languages are translated into machine code on the fly, while running, by another program called an interpreter. Computer hardware may fail or may itself have a fundamental problem that produces unexpected results in certain situations. For instance, the Pentium FDIV bug caused some Intel microprocessors in the early s to produce inaccurate results for certain floating point division operations. This was caused by a flaw in the microprocessor design and resulted in a partial recall of the affected devices.

Online Etymology Dictionary. Archived from the original on 16 November Retrieved 19 August Numbers through the ages 1st ed. Houndmills, Basingstoke, Hampshire: Macmillan Education. ISBN OCLC Retrieved 1 July Bibcode : Natur. PMID S2CID Archived from the original on 16 December Retrieved 12 March Wiet, V. Elisseeff, P. Wolff, J. Naudu Transactions of the American Philosophical Society.

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It is called the stored program architecture or stored program model, also known as the von Neumann architecture. We will use these terms interchangeably.

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By the s, the success of digital electronic computers had spelled the end for most analog computing machines, but analog computers remained in use during the s in some specialized applications such as education slide rule and aircraft control systems. By , the United States Navy had developed an electromechanical analog computer small enough to use aboard a submarine. This was the Torpedo Data Computer , which used trigonometry to solve the problem of firing a torpedo at a moving target.

During World War II similar devices were developed in other countries as well. Early digital computers were electromechanical ; electric switches drove mechanical relays to perform the calculation. These devices had a low operating speed and were eventually superseded by much faster all-electric computers, originally using vacuum tubes.

The Z2 , created by German engineer Konrad Zuse in , was one of the earliest examples of an electromechanical relay computer. In , Zuse followed his earlier machine up with the Z3 , the world’s first working electromechanical programmable , fully automatic digital computer. It was quite similar to modern machines in some respects, pioneering numerous advances such as floating-point numbers.

Rather than the harder-to-implement decimal system used in Charles Babbage ‘s earlier design , using a binary system meant that Zuse’s machines were easier to build and potentially more reliable, given the technologies available at that time. Zuse’s next computer, the Z4 , became the world’s first commercial computer; after initial delay due to the Second World War, it was completed in and delivered to the ETH Zurich.

Purely electronic circuit elements soon replaced their mechanical and electromechanical equivalents, at the same time that digital calculation replaced analog. The engineer Tommy Flowers , working at the Post Office Research Station in London in the s, began to explore the possible use of electronics for the telephone exchange. Experimental equipment that he built in went into operation five years later, converting a portion of the telephone exchange network into an electronic data processing system, using thousands of vacuum tubes.

The German encryption machine, Enigma , was first attacked with the help of the electro-mechanical bombes which were often run by women. Colossus was the world’s first electronic digital programmable computer.

It had paper-tape input and was capable of being configured to perform a variety of boolean logical operations on its data, but it was not Turing-complete. Colossus Mark I contained 1, thermionic valves tubes , but Mark II with 2, valves, was both five times faster and simpler to operate than Mark I, greatly speeding the decoding process. Like the Colossus, a “program” on the ENIAC was defined by the states of its patch cables and switches, a far cry from the stored program electronic machines that came later.

Once a program was written, it had to be mechanically set into the machine with manual resetting of plugs and switches. It combined the high speed of electronics with the ability to be programmed for many complex problems. It could add or subtract times a second, a thousand times faster than any other machine.

It also had modules to multiply, divide, and square root. High speed memory was limited to 20 words about 80 bytes. Built under the direction of John Mauchly and J. The machine was huge, weighing 30 tons, using kilowatts of electric power and contained over 18, vacuum tubes, 1, relays, and hundreds of thousands of resistors, capacitors, and inductors. The principle of the modern computer was proposed by Alan Turing in his seminal paper, [42] On Computable Numbers.

Turing proposed a simple device that he called “Universal Computing machine” and that is now known as a universal Turing machine. He proved that such a machine is capable of computing anything that is computable by executing instructions program stored on tape, allowing the machine to be programmable.

The fundamental concept of Turing’s design is the stored program , where all the instructions for computing are stored in memory. Von Neumann acknowledged that the central concept of the modern computer was due to this paper. Except for the limitations imposed by their finite memory stores, modern computers are said to be Turing-complete , which is to say, they have algorithm execution capability equivalent to a universal Turing machine.

Early computing machines had fixed programs. Changing its function required the re-wiring and re-structuring of the machine. A stored-program computer includes by design an instruction set and can store in memory a set of instructions a program that details the computation.

The theoretical basis for the stored-program computer was laid by Alan Turing in his paper. In , Turing joined the National Physical Laboratory and began work on developing an electronic stored-program digital computer. His report “Proposed Electronic Calculator” was the first specification for such a device.

The Manchester Baby was the world’s first stored-program computer. Grace Hopper was the first person to develop a compiler for programming language. The Mark 1 in turn quickly became the prototype for the Ferranti Mark 1 , the world’s first commercially available general-purpose computer. At least seven of these later machines were delivered between and , one of them to Shell labs in Amsterdam. The LEO I computer became operational in April [49] and ran the world’s first regular routine office computer job.

The concept of a field-effect transistor was proposed by Julius Edgar Lilienfeld in John Bardeen and Walter Brattain , while working under William Shockley at Bell Labs , built the first working transistor , the point-contact transistor , in , which was followed by Shockley’s bipolar junction transistor in Compared to vacuum tubes, transistors have many advantages: they are smaller, and require less power than vacuum tubes, so give off less heat.

Junction transistors were much more reliable than vacuum tubes and had longer, indefinite, service life. Transistorized computers could contain tens of thousands of binary logic circuits in a relatively compact space. However, early junction transistors were relatively bulky devices that were difficult to manufacture on a mass-production basis, which limited them to a number of specialised applications.

At the University of Manchester , a team under the leadership of Tom Kilburn designed and built a machine using the newly developed transistors instead of valves.

However, the machine did make use of valves to generate its kHz clock waveforms and in the circuitry to read and write on its magnetic drum memory , so it was not the first completely transistorized computer. Atalla and Dawon Kahng at Bell Labs in The next great advance in computing power came with the advent of the integrated circuit IC. The idea of the integrated circuit was first conceived by a radar scientist working for the Royal Radar Establishment of the Ministry of Defence , Geoffrey W.

Dummer presented the first public description of an integrated circuit at the Symposium on Progress in Quality Electronic Components in Washington, D. Noyce also came up with his own idea of an integrated circuit half a year later than Kilby. Produced at Fairchild Semiconductor, it was made of silicon , whereas Kilby’s chip was made of germanium. Noyce’s monolithic IC was fabricated using the planar process , developed by his colleague Jean Hoerni in early In turn, the planar process was based on Mohamed M.

Atalla’s work on semiconductor surface passivation by silicon dioxide in the late s. The development of the MOS integrated circuit led to the invention of the microprocessor , [84] [85] and heralded an explosion in the commercial and personal use of computers.

While the subject of exactly which device was the first microprocessor is contentious, partly due to lack of agreement on the exact definition of the term “microprocessor”, it is largely undisputed that the first single-chip microprocessor was the Intel , [86] designed and realized by Federico Faggin with his silicon-gate MOS IC technology, [84] along with Ted Hoff , Masatoshi Shima and Stanley Mazor at Intel.

System on a Chip SoCs are complete computers on a microchip or chip the size of a coin. If not integrated, the RAM is usually placed directly above known as Package on package or below on the opposite side of the circuit board the SoC, and the flash memory is usually placed right next to the SoC, this all done to improve data transfer speeds, as the data signals don’t have to travel long distances.

Since ENIAC in , computers have advanced enormously, with modern SoCs Such as the Snapdragon being the size of a coin while also being hundreds of thousands of times more powerful than ENIAC, integrating billions of transistors, and consuming only a few watts of power.

The first mobile computers were heavy and ran from mains power. The 50 lb 23 kg IBM was an early example. Later portables such as the Osborne 1 and Compaq Portable were considerably lighter but still needed to be plugged in. The first laptops , such as the Grid Compass , removed this requirement by incorporating batteries — and with the continued miniaturization of computing resources and advancements in portable battery life, portable computers grew in popularity in the s.

These smartphones and tablets run on a variety of operating systems and recently became the dominant computing device on the market. The term hardware covers all of those parts of a computer that are tangible physical objects.

Circuits , computer chips, graphic cards, sound cards, memory RAM , motherboard, displays, power supplies, cables, keyboards, printers and “mice” input devices are all hardware.

These parts are interconnected by buses , often made of groups of wires. Inside each of these parts are thousands to trillions of small electrical circuits which can be turned off or on by means of an electronic switch. Each circuit represents a bit binary digit of information so that when the circuit is on it represents a “1”, and when off it represents a “0” in positive logic representation. The circuits are arranged in logic gates so that one or more of the circuits may control the state of one or more of the other circuits.

When unprocessed data is sent to the computer with the help of input devices, the data is processed and sent to output devices. The input devices may be hand-operated or automated. The act of processing is mainly regulated by the CPU. Some examples of input devices are:. The means through which computer gives output are known as output devices. Some examples of output devices are:.

The control unit often called a control system or central controller manages the computer’s various components; it reads and interprets decodes the program instructions, transforming them into control signals that activate other parts of the computer. A key component common to all CPUs is the program counter , a special memory cell a register that keeps track of which location in memory the next instruction is to be read from.

The control system’s function is as follows— this is a simplified description, and some of these steps may be performed concurrently or in a different order depending on the type of CPU:. Since the program counter is conceptually just another set of memory cells, it can be changed by calculations done in the ALU.

Adding to the program counter would cause the next instruction to be read from a place locations further down the program. Instructions that modify the program counter are often known as “jumps” and allow for loops instructions that are repeated by the computer and often conditional instruction execution both examples of control flow.

The sequence of operations that the control unit goes through to process an instruction is in itself like a short computer program , and indeed, in some more complex CPU designs, there is another yet smaller computer called a microsequencer , which runs a microcode program that causes all of these events to happen. Early CPUs were composed of many separate components.

Since the s, CPUs have typically been constructed on a single MOS integrated circuit chip called a microprocessor. The ALU is capable of performing two classes of operations: arithmetic and logic. Some can operate only on whole numbers integers while others use floating point to represent real numbers , albeit with limited precision.

However, any computer that is capable of performing just the simplest operations can be programmed to break down the more complex operations into simple steps that it can perform. Therefore, any computer can be programmed to perform any arithmetic operation—although it will take more time to do so if its ALU does not directly support the operation.

An ALU may also compare numbers and return Boolean truth values true or false depending on whether one is equal to, greater than or less than the other “is 64 greater than 65? These can be useful for creating complicated conditional statements and processing Boolean logic.

Superscalar computers may contain multiple ALUs, allowing them to process several instructions simultaneously. A computer’s memory can be viewed as a list of cells into which numbers can be placed or read.

Each cell has a numbered “address” and can store a single number. The computer can be instructed to “put the number into the cell numbered ” or to “add the number that is in cell to the number that is in cell and put the answer into cell Letters, numbers, even computer instructions can be placed into memory with equal ease. Since the CPU does not differentiate between different types of information, it is the software’s responsibility to give significance to what the memory sees as nothing but a series of numbers.

In almost all modern computers, each memory cell is set up to store binary numbers in groups of eight bits called a byte. To store larger numbers, several consecutive bytes may be used typically, two, four or eight. When negative numbers are required, they are usually stored in two’s complement notation.

Other arrangements are possible, but are usually not seen outside of specialized applications or historical contexts. A computer can store any kind of information in memory if it can be represented numerically.

Modern computers have billions or even trillions of bytes of memory. The CPU contains a special set of memory cells called registers that can be read and written to much more rapidly than the main memory area. There are typically between two and one hundred registers depending on the type of CPU. Registers are used for the most frequently needed data items to avoid having to access main memory every time data is needed.

As data is constantly being worked on, reducing the need to access main memory which is often slow compared to the ALU and control units greatly increases the computer’s speed.

ROM is typically used to store the computer’s initial start-up instructions. In general, the contents of RAM are erased when the power to the computer is turned off, but ROM retains its data indefinitely.

In embedded computers , which frequently do not have disk drives, all of the required software may be stored in ROM. Software stored in ROM is often called firmware , because it is notionally more like hardware than software. Flash memory blurs the distinction between ROM and RAM, as it retains its data when turned off but is also rewritable.

It is typically much slower than conventional ROM and RAM however, so its use is restricted to applications where high speed is unnecessary. In more sophisticated computers there may be one or more RAM cache memories , which are slower than registers but faster than main memory. Generally computers with this sort of cache are designed to move frequently needed data into the cache automatically, often without the need for any intervention on the programmer’s part.

Hard disk drives , floppy disk drives and optical disc drives serve as both input and output devices. A graphics processing unit might contain fifty or more tiny computers that perform the calculations necessary to display 3D graphics.

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Retrieved 5 April Ars Technica. Archived from the original on 4 July Retrieved 14 June Archived from the original on 26 June Eck A K Peters, Ltd. Handbook of Parallel Computing and Statistics. CRC Press. Introduction to the Basic Computer. Porat Introduction to Microcomputers and the Microprocessors.

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Archived from the original on 30 January Bibcode : Sci Stokes, Jon San Francisco: No Starch Press. Zuse, Konrad The Computer — My life. Berlin: Pringler-Verlag. Felt, Dorr E. Mechanical arithmetic, or The history of the counting machine.

Chicago: Washington Institute. Ifrah, Georges Berkeley, Edmund Giant Brains, or Machines That Think. Cohen, Bernard Physics Today. Bibcode : PhT Paris: Robert Laffont. Couffignal, Louis Paris: Gauthier-Villars. Essinger, James Jacquard’s Web, How a hand loom led to the birth of the information age. Oxford University Press. Hyman, Anthony Charles Babbage: Pioneer of the Computer. Princeton University Press. Bowden, B. Faster than thought. New York, Toronto, London: Pitman publishing corporation.

Moseley, Maboth Irascible Genius, Charles Babbage, inventor. London: Hutchinson. Collier, Bruce The little engine that could’ve: The calculating machines of Charles Babbage.

Garland Publishing. Archived from the original on 20 January Randell, Brian Archived from the original PDF on 21 September Retrieved 29 October Smith, Erika E. Verma, G. Reliability performance of ETOX based flash memories. Basic computer components. Digital electronics. Digital signal Boolean algebra Logic synthesis Logic in computer science Computer architecture Digital signal Digital signal processing Circuit minimization Switching circuit theory Gate equivalent.

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International Business Times. March 15, Retrieved March 15, Retrieved April 8, March 16, Retrieved March 16, March 21, Retrieved March 22, March 28, Retrieved March 29, Retrieved April 2, Democracy Spring. Archived from the original on April 16, Fs deployed to Iceland”. The San Diego Union-Tribune. April 2, Retrieved April 3, NBC Sports. Retrieved April 5, Retrieved April 6, The Washington Post. Archived from the original on September 11, Retrieved April 5, — via washingtonpost.

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Retrieved April 18, — via usatoday. The Boston Globe. Retrieved April 19, — via nytimes. Retrieved April 20, — via nytimes. Alaskan Dispatch News. Retrieved April 20, New York Post. KTLA 5. Retrieved April 21, April 22, Retrieved April 22, April 25, Retrieved April 25, Our agency has a catalog of music bands and professional artists from authentic gospel in the African American style, reggae, jazz, soul, Pop, dance Gospel choir for concerts, weddings, and other events June 09, You are organizing an event and you want to listen to the real gospel?

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