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m moved Direct algebraic logic to Button-operated calculator: Beginning of a mayor rewrite. D.A.L vs everybody else is already them main focus. Also creating seperate pages are not a good option either as the various technics are mostly defined |
first edit after move so the content matches the heading again. |
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A Button-operated calculator is a hardware or software calculator which is operated using button - as oposed to a [[Formula calculator]] which is operated thrue entering formulars thue a keyboard.
== Reverse Polish Notation ==
{{main|Reverse Polish Notation}}
== infix logic ==
== algebraic logic ==
== [[BASIC]] notation ==
{{main|Pocket computer}}
== '''Direct algebraic logic (D.A.L.)''' ==
'''Direct algebraic logic (D.A.L.)''' is a method for entering equations on scientific calculators which allows symbols and numbers to be entered as they are written. [[Sharp Corporation|SHARP]] introduced it in [[1992]]<ref>[http://sharp-world.com/contents/calculator/features/standard/dal D.A.L description] from Sharp</ref>. Today D.A.L. is used almost with every scientific calculator except those which use [[Reverse Polish Notation]].
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Note 2: Some but not all BASIC programmable [[Pocket computer|Pocket computers]] had dedicated trigonometric keys <ref>The picture of the [http://pocket.free.fr/html/casio/fx-880p_e.html FX-880P] show sin, cos and tan keys on the second row right hand side.</ref>.
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== Criticism ==
As seen in the example above the increased need for <code>(</code> and <code>)</code> results in a larger number of key presses to enter a formula. In the example above: D.A.L. 9 key presses, BASIC: 12 .. 16 key presses, A.L.: 8 key presses, RPN: 7 key presses.
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== References ==
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