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There are various ways in which [[calculator]]s interpret keystrokes. These can be categorized into two main types:
* On a '''single-step''' or '''immediate-execution calculator''', the user presses a key for each operation, calculating all the intermediate results, before the final value is shown.<ref>Microsoft's Windows Operating System Calculator Accessory; 2001. Available on a Windows PC at: Start/All Programs/Accessories/Calculator.</ref><ref>MotionNET [http://www.motionnet.com/calculator Calculator page on the Internet] {{Webarchive |url=https://web.archive.org/web/20090501082324/http://www.motionnet.com/calculator/ |date=2009-05-01}}; 2006.</ref><ref>Flow Simulation Ltd [http://www.calculator.org/jcalc98.html Virtual Calc98 page on the Internet]; 2008.</ref>
* On an '''expression''' or '''formula calculator''', one types in an expression and then presses a key, such as "=" or "Enter", to evaluate the expression.<ref>Formula Calculators Pty Ltd [Home page on the Internet]; 2009.</ref><ref>Moisey Oysgelt [http://www.alemoi.com/math JavaScript Formula Calculator page on the Internet] {{Webarchive|url=https://web.archive.org/web/20181211020248/http://www.alemoi.com/math |date=2018-12-11 }}; 2000.</ref><ref>Haxial Software Pty Ltd [http://www.haxial.com/products/calculator Calculator Product page on the Internet] {{Webarchive |url=https://web.archive.org/web/20090428221125/http://www.haxial.com/products/calculator/ |date=2009-04-28}}; 2001</ref> There are various systems for typing in an expression, as described below.
=={{anchor|Chain|AES|AOS}}Immediate execution==
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