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#OOP_D_ITS - 6th - C++ Oop Inheritance

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  • The child inherits characteristics of the parent.Methods and data defined for the parent class.The child has special rights to the parents methods and data.Public access like any one elseProtected access available only to child classes (and their descendants).The child has its own unique behaviors and data.
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    • 1. C++ OOP :: Inheritance
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      Hadziq Fabroyir - Informatics ITS
    • 2. Classes Characteristic
      Classes are used to accomplish:
      Modularity► Scope for global (static) methods
      Blueprints for generating objects or instances
      Classes support
      Data encapsulation - private data and implementation.
      Inheritance-code reuse
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    • 3. Inheritance
      Inheritance allows a software developer to derive a new class from an existing one.
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    • 4. Inheritance
      The existing class is called the parent, super, or baseclass.
      The derived class is called a child or subclass.
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    • 5. Inheritance
      • The child inherits characteristics of the parent.
      • 6. The child has special rights to the parents methods and data.
      • 7. Public access like any one else
      • 8. Protected access available only to child classes (and their descendants).
      • 9. The child has its own unique behaviors and data.
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    • 10. Inheritance
      Inheritance relationships are often shown graphically in a classdiagram with the arrow pointing to the parent class.
      Inheritance should create an is-arelationship, meaning the child is a more specific version of the parent.
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      Animal
      Bird
    • 11. Examples: Base Classes and Derived Classes
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    • 12. Single / Multiple Inheritance ?
      Some languages, e.g., C++, allowMultiple inheritance, which allows a class to be derived from two or more classes, inheriting the members of all parents.
      C# and Java support only Single inheritance, meaning that a derived class can have only one parent class.
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    • 13. Class Hierarchies
      A child class of one parent can be the parent of another child, forming a class hierarchy
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    • 14. Classify It !
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    • 15. Class Hierarchies
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    • 16. Classify It !
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    • 17. Class Hierarchies
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    • 18. Class Hierarchies
      An inherited member is continually passed down the line
      Inheritance is transitive
      Good class design puts all common features as high in the hierarchy as is reasonable. Avoids redundant code.
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    • 19. References and Inheritance
      An object reference can refer to an object of its class, or to an object of any class derived from it by inheritance.
      For example, if the 2DShape class is used to derive a child class called Triangle, then a 2DShape reference can be used to point to a Triangle object.
      2DShape myShape;
      myShape = new 2DShape();

      myShape = new Triangle();
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    • 20. Overriding Methods
      A child class can override the definition of an inherited method in favor of its own
      That is, a child can redefine a method that it inherits from its parent
      The new method must have the same signature as the parent's method, but can have a different implementation.
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    • 21. Lect 28 P. 17
      Winter Quarter
      Function Overloading
      C++ supports writing more than one function with the same name but different argument lists. This could include:
      different data types
      different number of arguments
      The advantage is that the same apparent function can be called to perform similar but different tasks. The following will show an example of this.
    • 22. Lect 28 P. 18
      Winter Quarter
      Function Overloading
      void swap (int *a, int *b);
      void swap (float *c, float *d);
      void swap (char *p, char *q);
      int main ( )
      {
      int a = 4, b = 6 ;
      float c = 16.7, d = -7.89 ;
      char p = 'M' , q = 'n' ;
      swap (&a, &b) ;
      swap (&c, &d);
      swap (&p, &q);
      }
    • 23. Lect 28 P. 19
      Winter Quarter
      Function Overloading
      void swap (int *a, int *b)
      { int temp; temp = *a; *a = *b; *b = temp; }
      void swap (float *c, float *d)
      {float temp; temp = *c; *c = *d; *d = temp;}
      void swap (char *p, char *q)
      {char temp; temp = *p; *p = *q; *q = temp;}
    • 24. Comparison
      Overloading
      Overloadingdeals with multiple methods in the same class with the same name but different signatures
      Overloadinglets you define a similar operation in different ways for different data
      Example:
      int foo(string[] bar);
      intfoo(intbar1, floata);
      Overriding
      Overridingdeals with two methods, one in a parent class and one in a child class, that have the same signature
      Overridinglets you define a similar operation in different ways for different object types
      Example:
      class Base {
      publicvirtualintfoo() {} }
      class Derived {
      publicoverrideintfoo() {}}
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    • 25. Declaring a Derived Class
      Define a new class DerivedClass which extends BaseClass
      class BaseClass
      {
      // class contents
      }
      class DerivedClass : BaseClass
      {
      // class contents
      }
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    • 26. Declaring a Derived Class
      class A : base classaccess specifier B
      {
      member access specifier(s):
      ...
      member data and member function(s);
      ...
      }
      Valid access specifiers include public, protected, and private
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    • 27. Public Inheritance
      class A : public B
      { // Class A now inherits the members of Class B
      // with no change in the “access specifier” for
      } // the inherited members
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    • 28. Protected Inheritance
      class A : protected B
      { // Class A now inherits the members of Class B
      // with public members “promoted” to protected
      } // but no other changes to the inherited members
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    • 29. Private Inheritance
      class A : private B
      { // Class A now inherits the members of Class B
      // with public and protected members
      } // “promoted” to private
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    • 30. For your practice …
      Exercise
      Declare Classes of ...
      Shape (ex: public getColor(), protected color)
      2D Shape, 3D Shape (ex: public getArea(), protected edgeLength)
      Triangle, Circle, Square; Cube, Cylinder, Sphere
      Lab Session for lower order (Senin, 15.00-17.00)
      Lab Session for upper order (Senin, 19.00-21.00)
      Please provide:
      the softcopy(send it by email – deadline Sunday 23:59)
      the hardcopy(bring it when attending the lab session)
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    • 31. ☺~ Next: Virtual & Polymorphism ~☺
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