1. Eighth step for Learning C++ Programming
CLASS
Friend
Overloading vs Overriding
Protected
Polymorphism

2. 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.
11/2014

3. friend int printfoo( foo &f1); };
Friend Declaration
class foo {
private:
int i,j; …
friend class fee;
friend int printfoo( foo &f1); };
11/2014

4. [ practice 1 Friend ]

5. [ explain 1 Friend ]

6. 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); }

7. [ practice 2 method overriding (1/2) ]

8. [ practice 2 method overriding (2/2) ]

9. [ explain 2 method overriding ]

10. [ practice 3 Overriding & Overloading ]

11. [ explain 3 Overriding & Overloading ]

12. [ practice 4 Protected (1/2) ]

13. [ practice 4 Protected (2/2) ]

14. [ explain 4 Protected ]