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Inheritance

Inheritance. What is it?. Inheritance can be thought of as software reusability where one class inherits another classes' data & methods and adds new functionality of its own Parts: base class - the existing class derived class - the new class with inherited members and additional behaviors.

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Inheritance

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  1. Inheritance CS250 Introduction to Computer Science II

  2. What is it? • Inheritance can be thought of as software reusability where one class inherits another classes' data & methods and adds new functionality of its own • Parts: • base class - the existing class • derived class - the new class with inherited members and additional behaviors CS250 Introduction to Computer Science II

  3. Inheritance • Three kinds of inheritance exist in C++: • Public • Protected • Private CS250 Introduction to Computer Science II

  4. Public Inheritance • Every derived class object is also an object of the base class. • As an example, if the base class is "Vehicle" then a derived class might be "Cars" and "Trucks." Cars inherit the members and behaviors of a Vehicle and add other behaviors and members • Members of a derived class cannot directly access the private members of a base class CS250 Introduction to Computer Science II

  5. Examples of Inheritance • I would like to examine examples in the following order: • 1. Fig 9.4 on p. 615 (point.h) • 2. Fig 9.5 on pp. 616-617 (point.cpp) • 3. Fig 9.6 on p. 617 (pointtest.cpp) • 4. Fig 9.7 on p. 618 (circle.h) • 5. Fig 9.8 on pp. 619-620 (circle.cpp) • 6. Fig 9.9 on p. 621 (circletest.cpp) • 7. Fig 9.10 on pp. 622-623 (circle2.h) • 8. Fig 9.11 on pp. 623-624 (circle2.cpp) • 9. Fig 9.12 on p. 625 (point2.h) • 10. Fig 9.13 on pp. 625-626 (point2.cpp) • 11. Fig 9.14 on pp. 627 (circle3.h) • 12. Fig 9.15 on pp. 627-628 (circle3.cpp) • 13. Fig 9.16 on pp. 629-630 (circletest3.cpp) CS250 Introduction to Computer Science II

  6. Summary • We discussed inheritance • We covered: • Pages 610 - 630 CS250 Introduction to Computer Science II

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