The calculator I used in school was infix but, unlike this calculator, had: To guarantee that the expression does not get misinterpreted, the person writing the expression should always add parentheses/brackets and explicit multiplication signs, or use horizontal division bars where possible, to make the expression unambiguous. Implicit multiplication is a point of frequent confusion: (If the above is not displayed correctly, please view this comment on the HN website.) Since SpeedCrunch only accepts input in a single line, this would be the least unexpected way to interpret the expression, and consistent with how graphing calculators operate.Ī horizontal fraction bar, which SpeedCrunch does not support (since it only accepts single-line input), implies parentheses around the numerator and denominator. Implicit multiplication (which does not explicitly use a multiplication sign) has the same priority as any other multiplication: The contents of the parentheses are calculated first (P in PEMDAS), and then the multiplication is done later (MD in PEMDAS). Yes, that answer is incorrect since it breaks with calculator conventions. You either need to use left recursion or restructure the syntax tree afterwards. That version of the grammar, btw, avoids left recursion, so it ought to work as a PEG, but at the cost of the wrong associativity for "/" and "-". Product ::= atom product | atom "*" product | atomĪtom ::= number | variable | "-" atom | "(" expr ")"īut typical parser generators don't give you an easy way to provide a useful error message there. Quotient ::= atom "/" atom | atom "/" quotient Here's an untested and at any rate incomplete CFG demonstrating the technique:Įxpr ::= term | term "+" expr | term "-" expr Then the user can insert parentheses to disambiguate. Perhaps a better choice, especially for an interactive calculator, is to adopt partially ordered operator precedence, and reject the expression as ambiguous. You could make 1/2x where x = 4 evaluate to either 2 or 0.125, but either choice will have surprising results in some cases or to some people. but that's dead now.īut it's really neat to see how this all started from a day or two of hacking on a solution to a simple problem. I can't find Ariya's original 2004 announcement, I think the original link was. One of those was Ariya Hidayat's "SpeedCrunch", which has been actively maintained up to the present day. His blog post elicited several rapid responses from developers taking his PyQt-based mockup and turning it into a 'real' application (, ). Back then developers were often just unthinkingly cloning 'skeuomorphic' interfaces like Apple used back then, designing user interfaces that resembled physical objects instead of taking advantage of the opportunities afforded by computers. We’re DMCA-compliant and gladly to cooperation with you.Fun fact about SpeedCrunch history, the software descends from an off-hand blog post by Roberto Alsina, a KDE developer, complaining about KCalc usability. We are not directly affiliated with them.Īll trademarks, registered trademarks, item names and business names or logos that talked about in right here would be the assets of their respective owners. eCalc Scientific Calculator is a windows app that created by EEWeb. When you click the “ Download” hyperlink on this web page, files will downloading straight in the owner sources (Official sites/Mirror Site). This eCalc Scientific Calculator App installation file is completely not hosted on our Server. Link: Precise Calculator Alternative and Reviews Programmable scientific calculator which has more than 150 mathematical functions and all of them return as many digits as you need. Link: Caligator Alternative and Reviews Precise Calculator Link: Windows Calculator Alternative and Reviews CaligatorĪ kickass, open-source calculator that lets you do calculations and unit conversions naturally, with features like: – weight conversion – length conversion -… Link: Qalculate! Alternative and Reviews Windows CalculatorĪ simple yet powerful calculator that includes standard, scientific, and programmer modes, as well as a unit converter. It is simple to use but provides power and versatility normally reserved for complicated math packages… Qalculate! is a multi-purpose cross-platform desktop calculator. Link: SpeedCrunch Alternative and Reviews Qalculate! SpeedCrunch is a free, fast, high precision open source algebraic calculator with an intuitive interface and a extensive list of features, including: Unlimited… Please make sure to select the app that suitable with your PC OS. You can select one of this best alternative app for eCalc Scientific Calculator on below. Here we go, eCalc Scientific Calculator Alternatives and Similar Software. Advertisement Download Best eCalc Scientific Calculator Alternative
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