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An Introduction to Design Patterns in C++ with Qt 4 (Bruce by Alan Ezust, Paul Ezust

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By Alan Ezust, Paul Ezust

Research C++, styles, and Qt four Cross-Platform DevelopmentMaster C++ and layout styles jointly, utilizing the world's major open resource framework for cross-platform improvement: Qt four. An creation to layout styles in C++ with Qt four is a whole instructional and reference that assumes no earlier wisdom of C, C++, gadgets, or styles. you will stroll via each center inspiration, one step at a time, studying via an in depth selection of Qt 4.1-tested examples and workouts. by the point you are performed, you will be developing multithreaded GUI functions that entry databases and control XML files--applications that run on structures together with home windows, Linux, Unix, and Mac OS X. better of all, you can be writing code that is effective, reusable, and chic. study gadgets quick: periods, inheritance, polymorphism, and extra grasp robust layout styles notice effective high-level programming concepts utilizing libraries, generics, and boxes construct graphical functions utilizing Qt widgets, types, and perspectives study complex suggestions starting from multithreading to reflective programming Use Qt's integrated periods for getting access to MySQL info features a whole C++ language reference

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On a typical *nix installation that file can be found in a subdirectory of /usr/include. 1 main and Command Line Arguments main() is a function (see Chapter 5), that is called at program startup. If the program accepts command line arguments, we must define main with its full parameter list. C permits flexibility in the ways that arguments are defined in main(), so you may see it defined in a variety of ways: int main(int argc, char* argv[]) int main(int argc, char ** argv) int main(int argCount, char * const argValue[]) All of the above forms are valid, and each defines two parameters.

30 Streams . . . . . . . . . . . . . . . 31 The Keyword const . . . . . . . . . 34 Pointers and Memory Access . . . . . 36 const* and *const . . . . . . . . . . 40 Reference Variables . . . . . . . . . ” It enhances C by adding several higher-level features such as strong typing, data abstraction, references, operator and function overloading, and considerable support for objectoriented programming. C++ retains the key features that have made C such a popular and successful language: speed, efficiency, and a wide range of expressiveness that allows programming at many levels, from the lowest (such as direct operating system calls or bitwise operations) to the highest level (manipulating large complex objects or graphs of objects).

Lucky2) cerr << "ERROR! = pi) cerr << "ERROR! 18. E X A M P L E 1 . cpp [ . . 16 so that it does the following: ■ It gets the file name from the user as an STL string fileName. c_str() to convert the string to a form that is acceptable to the open( ) function. ■ It makes sure that the file specified by the user does not already exist (or that it is all right to overwrite it if it does exist) before opening it for output. ■ It makes sure that the file exists before attempting to read from it.

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