TAILIEUCHUNG - Absolute C++ (4th Edition) part 47

Absolute C++ (4th Edition) part 47. KEY BENEFIT: C++ programming concepts and techniques are presented in a straightforward style using understandable language and code. KEY TOPICS: C++ Basics; Flow of Control; Function Basics; Parameters and Overloading; Arrays; Structures and Classes; Constructors; Operator Overloading, Friends, and References; Strings; Pointers and Dynamic Arrays; Separate Compilation and Namespaces; Streams and File I/O; Recursion; Inheritance; Polymorphism and Virtual Functions; Templates; Linked Data Structures; Exception Handling; Standard Template Library; Patterns and UML. MARKET: Useful for both beginning and intermediate C++ programmers. . | Separate Compilation 467 about include directives and linking separate files. Why bother with three separate files There are several advantages to dividing your program into separate files. Since you have the definition and the implementation of the class DigitalTime in files separate from the application file you can use this class in many different programs without needing to rewrite the definition of the class in each of the programs. Moreover you Defining a Class in Separate Files A Summary You can define a class and place the definition of the class and the implementation of its member functions in separate files. You can then compile the class separately from any program that uses the class and you can use this same class in any number of different programs. The class is placed in files as follows 1. Put the definition of the class in a header file called the interface file. The name of this header file ends in .h. The interface file also contains the declarations prototypes for any functions and overloaded operators that define basic class operations but that are not listed in the class definition. Include comments that explain how all these functions and operators are used. 2. The definitions of all the functions and overloaded operators mentioned above whether they are members or friends or neither are placed in another file called the implementation file. This file must contain an include directive that names the interface file described above. This include directive uses quotes around the file name as in the following example include The interface file and the implementation file traditionally have the same name but end in different suffixes. The interface file ends in .h. The implementation file ends in the same suffix that you use for files that contain a complete C program. The implementation file is compiled separately before it is used in any program. 3. When you want to use the class in a program you place the main part of the program and .

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