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A '''Button-operated calculator''' is a hardware or software calculator which is operated using
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There are varius ways in which the in which a button-operated calculator might interpret key strokes.
=== Reverse Polish Notation (RPN) ===
{{main|Reverse Polish Notation}}
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Note example 1 which is one of the few examples where Reverse Polish Notation does not use the fewest button presses - provided one does not rearange operants. If one would do so then ony 5 key strokes would be needed.
=== infix notation (without [[order of operations]]) ===
{{main|Infix notation}}
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From the first example one can see that it is nessesary to rearage operants in order to get the correct result.
=== infix notation (with [[order of operations]]) ===
{{main|order of operations}}
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=== [[BASIC]] notation ===
{{main|Pocket computer}}
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=== '''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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[[Category:Calculators]]
{{tech-stub}}
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