Calculator input methods: Difference between revisions

Revision as of 11:34, 11 October 2023

Revision as of 13:43, 14 October 2023

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[[File:TI-108.jpg|thumb|upright|The [[TI-108]] is a simple four-function calculator which uses single-step execution.]]

The '''immediate execution''' mode of operation (also known as '''single-step''', '''algebraic entry system''' ('''AES''')<ref name="Ball_1978"/> or '''chain calculation''' mode) is commonly employed on most general-purpose calculators. In most simple four-function calculators, such as the [[Windows Calculator|Windows calculator]] in Standard mode and those included with most early [[operating system]]s, each [[binary operation]] is executed as soon as the next operator is pressed, and therefore the [[order of operations]] in a mathematical expression is not taken into account. [[Scientific calculators]], including the Scientific mode in the Windows and SGPA calculator and most modern software calculators, have buttons for brackets and ''can'' take order of operation into account. Also, for [[unary operation]]s, like √ or ''x''², the number is entered first, then the operator; this is largely because the display screens on these kinds of calculators are generally composed entirely of [[Seven-segment display|seven-segment characters]] and thus capable of displaying only numbers, not the functions associated with them. This mode of operation also makes it impossible to change the expression being input without clearing the display entirely.

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