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187:. This is not a formula calculator, but it is not an immediate-execution calculator either: with 2*(3+4)*5, the first * isn’t executed when the next operator, +, is entered, but when the second * is entered. With this example, any number of operations could be entered between the parentheses before the first * is executed, and so perhaps
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There are important distinctions between what this article is describing as "immediate execution with operator precedence" versus true infix notation. Consider, for example, the following series of (all current-production) scientific calculators from Casio, Sharp, and Texas
Instruments. Casio fx-260,
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An historical approach is fine by me, but it should be noted that the phrase "an industry-first" is misleading because both graphic calculators (e.g. fx-7000G introduced in 1985) and programmable calculators (e.g. fx-4500P) could do things like 1+2sin 30=. It might be closer to the truth to say the
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You will see the intermediate result 0.5 immediately upon pressing (establishing the first elevation of operator precedence), then another intermediate result 2.5 immediately upon pressing the second (ending the second level of priority elevation which had previously started when you had pressed
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to that point within the current level of precedence, and then use whatever result ended up in the working register as the input to the operator; whereas the latter models from each brand would expect the inputs to those operators to
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So I would like to clarify the definitions. Also, there is more to calculator input than the interpretation of keystrokes, and I would like to deal with several other ways in which calculators differ in their methods of input.
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Please can an expert tidy up the references? For example, reference 10 currently reads "Reference 11, section 2"; I think "Reference 11" means
Thimbleby (currently reference 7). I'm not sure which of the formats from
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calculation entry and immediately their operands are known. Also, if calculators are differentiated according to when operations are executed and values shown, perhaps calculators that show the final value only
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But for single-operand operators, such as sin, cos, log, e^, the former models from each brand, upon encountering such an operator, would evaluate all of the operations which had been input
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https://archive.is/20120723100846/http://www.articlesalley.com/article.detail.php/7013/178/Education/Internet/36/Declarative_Programming_-_Strategies_for_Solving_Software_Problems
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I agree with you on both accounts. When I first read about D.A.L. my first though was "What about my Sharp PC-1403 - that would do 1 + 2 * sin (30) when used in basic mode..." --
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Also it should be noted that even today you can buy calculators for several different input methods, that is to say new methods did not completely replace older methods.
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The first "calculator" to use RPN was the HP9100A, which was introduced in 1968, although this machine is now regarded by many as the first desktop computer.
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compute the sin(30) step at the very instant the sin key is pressed, yielding the intermediate result 0.5, before giving the overall result when you press .
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Algebraic Entry calculators don't execute each operation immediately. They save the whole thing, and then execute the multiplications before the additions.
184:- that the operations are executed “when the next operator is pressed” – may exclude some calculators with parentheses buttons or precedence mode, such as
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In April 1970, the
Pocketronic appeared on the Japanese market; it was a four-function, entirely electronic calculator that retailed for about $ 400.
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The SR-50 A TI SR-50 (1974) of the first calculators to implement "algebraic logic" (i.e. operator precedence) where 1 + 2 x 3 gives you 7, not 9
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http://www.articlesalley.com/article.detail.php/7013/178/Education/Internet/36/Declarative_Programming_-_Strategies_for_Solving_Software_Problems
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The fact that immediate execution really is going on, becomes even more obvious if you compute the (contrived) example 1.5 + sin(30) * 2 + 0.5
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Introduced in 1992 and an industry-first, SHARP's D.A.L. allows symbols and numbers of an equation to be entered as they are written. .
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In examples using 2-operand operators, such as +-*/, etc, all of the above calculators will use the exact same sequence of keystrokes.
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When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
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So, in degrees mode, to evaluate 1.5 + sin(30), we would have different keystrokes for the former models than for the latter models:
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Algebraic Entry is a type of
Formula Entry that saves the whole expression, and executes the multiplications before the additions.
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All of these models are commonly referred to as "Algebraic", but only the latter category are actually using true infix input.
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I think the article is should reflect historical evolution of calculator input methods. I identified the following phases:
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Why is the RPN example not done with only 6 keystrokes? * 3 enter 2 x 1 + is how it would be entered in real life.
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The article makes a mis-statement that needs to be fixed, when it says that
Algebraic Entry is Immediate Execution.
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1980 with the introduction of the Sharp PC-1211, the first pocket computer programmable in a high-level language.
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to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the
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I am not sure if the article intends to cover all calculators with the two definitions (it says there are two
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So, to evaluate 1 + 2 * 3, we would use the exact same sequence of keystrokes for every one of those models:
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If you have discovered URLs which were erroneously considered dead by the bot, you can report them with
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on
Knowledge. If you would like to participate, please visit the project page, where you can join
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The ordinary calculator that isn't a scientific calculator is an immediate execution calculator.
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before doing mass systematic removals. This message is updated dynamically through the template
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is taken literally, it excludes calculations typed into multi-line edit boxes, which don’t use
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https://web.archive.org/web/20070207044654/http://www.uclic.ucl.ac.uk/harold/srf/allcalcs.pdf
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I am considering a re-write of the first section of the article, for the following reasons.
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Indeed, in the former models, if you perform the trig example, you can actually watch it
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One problem for an encyclopaedic article is that not all phases have an official name.
704:, "External links modified" talk page sections are no longer generated or monitored by
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If you found an error with any archives or the URLs themselves, you can fix them with
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The article makes a good distinction between
Immediate Execution, and Formula Entry.
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or elsewhere is best for this mixture of references to whole documents and sections.
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is a better term for this type of calculator. Also, if the article’s definition of a
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which allows symbols and numbers of an equation to be entered as they are written.
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I think it is saying that in infix notation it only requires 5 presses. — Carl
710:. No special action is required regarding these talk page notices, other than
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Sharp EL-501XT, TI-30Xa; versus Casio fx-991MS, Sharp EL-510RT, TI-30X IIS.
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Formula calculators have been made for boyh
Algebraic Entry and for RPN.
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How do you get down to five key strokes ? Is there a shorter way than
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http://www.vintagecalculators.com/html/hand-held_calculators.html
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http://www.datamath.org/Story/Datamath.htm#Texas%20Instruments
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the key), and finally the correct result 3 after pressing .
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Knowledge:Citing sources/Example edits for different methods
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for additional information. I made the following changes:
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calculator can be defined as one that executes operators
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the whole calculation has been entered, can be known as
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1970 Immediate execution with out operator precedence
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381:Could not find out when this was first introduced.
360:1974 Immediate execution with operator precedence
268:Reverse Polish notation (RPN) (postfix notation)
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787:Low-priority mathematics articles
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518:...infix and postfix.
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702:After February 2018
521:So it's like this:
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70:Mathematics
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763:Report bug
321:Hopf-Rinow
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340:Evolution
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