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 an entire instructional and reference that assumes no past wisdom of C, C++, gadgets, or styles. you will stroll via each center idea, one step at a time, studying via an intensive choice of Qt 4.1-tested examples and routines.

By the time you are performed, you will be growing multithreaded GUI functions that entry databases and control XML files--applications that run on systems together with home windows, Linux, Unix, and Mac OS X. better of all, you can be writing code that is effective, reusable, and stylish.

  • Learn items quick: periods, inheritance, polymorphism, and more
  • Master strong layout styles
  • Discover effective high-level programming ideas utilizing libraries, generics, and containers
  • Build graphical functions utilizing Qt widgets, versions, and views
  • Learn complicated options starting from multithreading to reflective programming
  • Use Qt's integrated periods for gaining access to MySQL data
  • Includes an entire C++ language reference

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Additional resources for An Introduction to Design Patterns in C++ with Qt 4

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9. C++ Standard Library Strings Our early (pre-Qt) examples will make use of C++ Standard Library strings (see Appendix B). Standard Library strings have many disadvantages when compared to QStrings, but they are easy to use and have a similar public interface that includes many functions to construct and modify strings. 14 demonstrates its basic usage. 14. out This is a string. The length of that string is 17 Enter a sentence: 20 years hard labour Here is your sentence: 20 years hard labour The length of it was: 20 src/generic> Observe that we used the getline(istream, string) function to take a string from standard input stream.

We discuss this in more detail in Chapter 19. 11 shows that the result of a double divided by an int is a double. 11. cpp [ . . ] cout << "z / j = " << z / j << endl ; C++ also provides a full set of boolean operators to compare numeric expressions. Each of these operators returns a bool value of either false or true. ) operator. 2. 12. cpp [ . . ] /* if() ... else approach */ if(x * j <= z) cout << x * j << " <= " << z << endl ; else cout << x * j << " > " << z << endl; /* conditional operator approach */ cout << x * k <<( (x * k < y * j) ?

Since the range of values for a particular type depends on the underlying architecture of the machine on which the compiler is running, the ANSI/ISO standard for C++ does not specify the size (in bytes) of any of these types. 2. 2. Simple Types Hierarchy Byte/char types Integral types Floating point types bool short int float char int double signed char long int long double unsigned char unsigned short wchar_t unsigned int unsigned long There is a special operator sizeof() that returns the number of chars[12] that a given expression requires for storage.

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