An Introduction to Design Patterns in C++ with Qt 4 by Alan Ezust

By Alan Ezust

Learn C++, styles, and Qt four Cross-Platform Development

Master C++ and layout styles jointly, utilizing the world's prime open resource framework for cross-platform improvement: Qt four.

An advent to layout styles in C++ with Qt four is a whole educational and reference that assumes no prior wisdom of C, C++, gadgets, or styles. you are going to stroll via each center suggestion, one step at a time, studying via an in depth selection of Qt 4.1-tested examples and routines.

By the time you are performed, you may 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 will be writing code that is effective, reusable, and chic.

  • Learn items speedy: sessions, inheritance, polymorphism, and more
  • Master robust layout styles
  • Discover effective high-level programming ideas utilizing libraries, generics, and containers
  • Build graphical purposes utilizing Qt widgets, versions, and views
  • Learn complex concepts starting from multithreading to reflective programming
  • Use Qt's integrated periods for having access to MySQL data
  • Includes a whole C++ language reference

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Cpp [ . . ] cout << "k / i = " << k / i << "\tk % j = " << k % j << endl ; cout << "i = " << i << "\tj = " << j << "\tk = " << k << endl; cout << "++k / i = " << ++k / i << endl; cout << "i = " << i << "\tj = " << j << "\tk = " << k << endl; cout << "i * j-- = " << i * j-- << endl; cout << "i = " << i << "\tj = " << j << "\tk = " << k << endl; Mixed expressions, if valid, generally produce results that are of the widest of the argument types. We discuss this in more detail in Chapter 19. 11 shows that the result of a double divided by an int is a double.

1. 2. Operators new and delete C++ has a mechanism that permits storage to be allocated dynamically at runtime. This means that the programmer does not need to anticipate the memory needs of a program in advance and make allowances for the maximum amount of memory that might be needed by the program. Dynamic allocation of storage at runtime is a powerful tool that helps to build programs that are efficient and flexible. Thenew operator allocates storage from the memory heap (also called the heap, free pool, or free storage) and returns a pointer to the newly allocated object.

6 shows how certain characters need to be escaped inside double-quoted string delimiters. 6. cpp #include #include int main() { using namespace std; const char* charstr = "this is one very long string " "so I will continue it on the next line"; string str = charstr; <-- 1 cout << str << endl; cout << "\nA\tb\\c\'d\"" << endl; return 0; } (1)STL strings can hold onto C-style char* strings. out The output should look something like this: this is one very long string so I will continue it on the next line A b\c'd" Notice that this program shows a way to avoid very long lines when dealing with string literals.

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