Download E-books Learn BlackBerry 10 App Development: A Cascades-Driven Approach PDF

By Anwar Ludin

Learn easy methods to leverage the BlackBerry 10 Cascades framework to create wealthy local functions. Learn BlackBerry 10 App Development delivers an effective origin for developing BlackBerry 10 apps successfully. alongside the best way, you are going to use QML and JavaScript for designing your app’s UI, and C++/Qt for the applying good judgment. No earlier wisdom of C++ is believed and the ebook covers the basic points of the language for writing BlackBerry 10 apps. additionally a specific emphasis is wear tips to create a visually attractive consumer event with the Cascades framework, that is according to Qt and QML.

Starting with the local SDK configuration and an summary of the Momentics IDE, the e-book is fast moving and you'll quickly study a number of the most sensible practices and methods required for constructing attractive BlackBerry 10 apps.

Learn BlackBerry 10 App improvement is written for builders wishing to profit tips on how to write apps for the hot BlackBerry 10 OS and people attracted to porting latest iOS and Android apps to BlackBerry 10 as local applications.

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Let’s try and use them in perform. A small try out software is given in directory 3-9. directory 3-9. major. cpp #include #include "Stock. h" #include "Option. h" int main() { inventory inventory; inventory. setSymbol("orcl"); inventory. setSpot(50); choice choice; choice. setSymbol("myOption"); choice. setSpot(50); choice. setStrike(55); choice. setMaturity(0. 5); choice. setVolatility(0. 2); choice. setRiskfreeRate(. 05); std::cout << "Stock cost is: " << inventory. price() << std::endl; std::cout << "Option expense is: " << alternative. price() << std::endl; } To demonstrate the program’s output, i'm utilizing the traditional C++ library via together with the iostream header (std::cout is the normal output circulation, which monitors characters in a textual content console by means of default). The program’s output is given as follows: inventory rate is: 50 alternative cost is: 1. 45324 Polymorphism We outlined the inventory and alternative classification, yet for our type library to be really important, we have to manage to manage them utilizing the typical base category software interface. In perform, we care approximately having the ability to cost tools irrespective of the concrete sort; if it is a inventory or an alternative. In different phrases, we wish to be ready to control monetary tools utilizing the bottom type device abstraction. If the tool is a inventory, it is going to go back its industry spot cost, and if it’s an alternative, it is going to go back the Black-Scholes fee. this is often precisely what we suggest by means of polymorphism: the facility to enforce the pricing good judgment another way counting on the underlying concrete sort and having the ability to name at runtime the right kind implementation utilizing the tool base category abstraction. In C++, runtime polymorphic habit is completed utilizing mechanisms: references and tips. utilizing References A reference is basically an alias to an current variable. directory 3-10 exhibits you ways to take advantage of a reference while pricing an choice. directory 3-10. utilizing References alternative choice; alternative. setOptionType(Option::CALL); choice. setSymbol("myOption"); choice. setSpot(50); alternative. setStrike(55); alternative. setTimeToMaturity(0. 5); choice. setRiskfreeRate(. 05); choice. setVolatility(. 2); tool& instr = choice; std::cout << "Instrument image is: " << instr. symbol(). toStdString() << std::endl; std::cout << "Instrument rate is: " << instr. price() << std::endl; As proven in directory 3-10, instr is outlined as a connection with an device through including an ampersand (&) after the kind statement (note that simply because a reference is an alias to an present item, the definition should also comprise the referenced alternative object). ultimately, the price() process is named polymorphically utilizing the tool base type interface (remember that cost is a natural digital functionality in Instrument’s category definition). The program’s output is given as follows: software image is: myOption software fee is: 1. 45324 otherwise of utilizing references is by way of taking them as functionality parameters. for instance, directory 3-11 defines a showInstrumentPrice() functionality taking a connection with an device (note the & indicating a pass-by-reference of the software parameter).

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