1. C++ Programming CLASS This pointer Static Class Friend Class
Operator Overloading
Inheritance

2. { this -> radius = radius; }
this-pointer
this returns always a reference to the
current object. Example: Circle::Circle(double radius)
{ this -> radius = radius; }
radius of the current (new) object
constructor’s argument
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3. this-pointer class AAA{ private: int a; char c; double d;
void set(AAA *pa) {
cin >> pa -> a;
cin >> pa -> c;
cin >> pa -> d;
class AAA{
private:
int a;
char c;
double d;
void set() //void set(AAA *this) {
cin >> this -> a;
cin >> this -> c;
cin >> this -> d;
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4. [ practice 1 this pointer ]

5. [ practice 1 this pointer ]

6. [ practice 2 Static class ]
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7. A Class can declare other classes as "friend classes".
Friends
A Class can declare other classes as
"friend classes".
A Class can declare external functions
as "friends".
friends can access private members
and methods.
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8. friend int printfoo( foo &f1); };
Friend Declaration
class foo {
private:
int i,j; …
friend class fee;
friend int printfoo( foo &f1); };
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9. [ practice 3 Friend ]

10. [ practice 3 Friend ]

11. for “standard” functions
Operator overloading
Operator overloading
for “standard” functions
Like a normal function definition but with operator-binding syntax with the function name.
E.g. + operator: <datatype> operator+ (double a, classA b) { … }
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12. [ practice 4 Operator overloading ]

13. You can create a new class that inherits from an existing class.
Inheritance
You can create a new class that inherits from an existing class.
The new class is a specialization of the
existing class (called subclass).
You can add new members and methods.
You can replace methods.
Motivation: Reuse of existing code
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14. Example: You have a class that represents “circles".
Inheritance
Example:
You have a class that represents “circles".
Create a new class that represents
“cylinders".
Most of the behavior and attributes are
the same, but a few are different/new
(height of cylinder, different area
computation, volume)
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15. A Cylinder is a extended (specialized) form of a Circle.
Inheritance Example
A Cylinder is a extended (specialized) form of a Circle.
height
Circle
Cylinder
radius
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16. [ practice 5 inheritance ]

17. [ practice 5 inheritance…continue ]

18. [ practice 5 inheritance ]

19. Overloading vs Overriding
- allows creating several methods with the same name which differ from each other in the type of the input and the output of the function. Polymorphism way.
Overriding
- allows a child class to provide a specific implementation of a method that is already provided by one of its parent classes
Overloading
Overriding
method name
same
type or number of parameter
different
return type
same or different
class C {
public :
void test(int a);
void test(char b); }
class D : public C {
public :
void test(int a);
int test(int a); }

20. [ practice 6 method overriding (1/2) ]

21. [ practice 6 method overriding (2/2) ]

22. [ practice 6 method overriding ]

23. [ practice 7 Overriding & Overloading ]

24. [ explain 7 Overriding & Overloading ]

25. [ Exercise 1 Static & inheritance]
Super class: Person
Sub class: Student
사람(학생) 수: Static data member