Speedcrunch android software#

(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.ДЄ 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 | atomДЄtom ::= number | variable | '-' atom | '(' expr ')'Д«ut 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:Д®xpr ::= 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.Д«ut 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.

Speedcrunch android software#

SpeedCrunch is an open-source tool for Windows and Linux.Fun fact about SpeedCrunch history, the software descends from an off-hand blog post by Roberto Alsina, a KDE developer, complaining about KCalc usability. The program wonвЂ™t turn you into a math expert, but it's genuinely easy to use, and even beginners will quickly figure out its basic operations. Put it all together and SpeedCrunch is an appealing tool. Individual sessions may be saved as necessary, allowing you to carry on later, or you can export them to text or HTML for easy sharing with others. Even if you've spent the last 30 minutes working in decimal and degrees, for instance, you can change to binary, hex, radians, Cartesian or polar output, maybe set a different level of precision, and the history window updates immediately with the new format. Whatever you're doing, the programвЂ™s flexibility is key. If you need more, you can store results in variables, define your own functions, use complex numbers, and perform all your calculations with up to 50 digits of precision. Again, double-click anything helpful and itвЂ™s entered into the expression area. These can be viewed and searched in a panel if youвЂ™re not sure what to enter, or you can start typing and allow the Autocomplete feature to show you any options (type 'G', select Geomean - the geometric mean - and itвЂ™s entered for you).ДЄ built-in Formula book has a small number of expressions on offer: quadratic equations, the volume of a cone, area of a sphere, and so on. There are 80 built-in mathematical functions and 150 scientific constants ready for use. It doesnвЂ™t mind if you type '2+2' or '2+2=', you'll get the same answer as soon as you hit Enter. SpeedCrunch isnвЂ™t strict about its own syntax. ThereвЂ™s an optional numeric keypad (View > Keypad) if you prefer clicking buttons to typing, although it'll probably just slow you down.