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An electronic calculator is a small, portable electronic device used to perform calculationsranging from basic arithmetic to complex mathematics. The first solid state electronic calculator was created in the s, building on the extensive history of tools such as the abacus developed around BCand the mechanical calculator developed in the 17th century AD. It was developed in parallel with the analog computers of the day. The pocket sized devices became available in the s, especially after the first microprocessorthe Inteldeveloped by Intel for the Japanese calculator company Busicom. They later became used commonly within the petroleum industry oil and gas. Modern electronic calculators vary: from cheap, give-away, credit-card-sized models to sturdy desktop models with built-in printers. They became popular in the mids as integrated casio custom rom ics high school made their size and cost small. By the end of that decade, calculator prices had reduced to a point where a basic calculator was affordable to most and they became common in schools. Computer operating systems as far back as early Unix have included interactive calculator programs such as dc and hocand calculator functions are included in almost all personal digital assistant PDA type devices save a few dedicated address book and dictionary devices. In addition to general purpose calculators, there are those designed for specific markets. For example, there are scientific calculators which include trigonometric and casio custom rom ics high school calculations. Some calculators even have the ability to do computer algebra. Graphing calculators can be used to graph functions defined on the real line, or higher-dimensional Euclidean space. As of updatebasic calculators cost little, but the scientific and graphing models tend to cost more. Bythis diminished to less than 0. Most basic calculators assign only one digit or operation on each button; however, in more specific calculators, a button can perform multi-function working with key combinations.



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