By Alan Ezust, Paul Ezust
This e-book fills a void among the various syntax-oriented programming texts that train readers how one can software in C++ with average I/O (e.g., Deitel) and the really few books that think an information of OOP/C++ and emphasize GUI programming utilizing higher-level frameworks (e.g., Blanchette). there are many books on C++ programming yet, with few exceptions, the person interface is restricted to both primitive terminal I/O, or closed-source, non-portable libraries (e.g., Microsoft starting place Classes).
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Extra resources for Introduction to Design Patterns in C++ with Qt, 2/E
We include this example here, even though the code contains a few things that have not been discussed yet so that you can see another way to ask for input and present output, using Qt graphical user interface (GUI) convenience functions.
Info 26 Chapter 1 C++ Introduction Observe that we used getline(cin, s2) to extract a string from the standard input stream. 8. It produces the same output. length() << endl; return 0; 2 } 1 Define QTextStreams that look like C++ standard iostreams. 2 not iostream, QTextStream::readLine()! readLine() to extract a QString from the standard input stream. 9 Streams Streams are objects used for reading and writing. The Standard Library defines
Cout, console output, the console screen by default. cerr, console error, another output stream to the console screen that flushes more often and is normally used for error messages. 1, we used the global ostream object, cout. We also called one of its member functions, operator<<(). 7 The syntax for that output statement is also quite interesting. operator<<("Factorial of: "); we invoked the same function using the more elegant and readable infix syntax: cout << "Factorial of: "; This operator can be chained (used on multiple values) and is predefined for use with many built-in types, as you see in the next output statement.