oop

2. inheritance

3. Mode of inheritance:
There are three mode of inheritance
1. Public
2. Private
3. protected

5. Private Inheritance with private data
member

6. Private Inheritance with public data
members

7. Private Inheritance with protected
data members

8. Public Inheritance with public data
members

9. Public Inheritance with protected data
members

10. Public Inheritance with private data
members

11. Protected Inheritance with public data
members

12. Protected Inheritance with private
data members

13. Protected Inheritance with protected
data members

14. Types of inheritance
There are 2 types of inheritance as shown
below.
1. Single Inheritance
2. Multiple Inheritance

15. 1. Single inheritance:
There are 3 types of single inheritance
1. Simple Inheritance
2. Multilevel Inheritance
3. Hierarchical Inheritance

16. Simple Inheritance
In Simple Inheritance we have only one parent
class and one child class.

17. Multilevel Inheritance
• Class derived from another derived class
• Class B derived from A and Class C derived
from B

18. Syntax:
Example of multilevel inheritance:
class A //base class
class B : public A
class C : public B

19. Multiple inheritance
• Class derived from more than one base class
• Class C inherit features of A and B

20. Syntax:
Example of multiple inheritance:
class A //base class
class B //base class
class C : public A , B //derived class

21. Hierarchical Inheritance
• More than one classes derived from single class
• All classes inherit features of class A

22. syntax:
Example of hierarchical inheritance:
class A //base class
class B : public A
class C : public A

23. Hybrid Inheritance
• Combination of two or more inheritance
• If two or more inheritance exists

24. Constructor and destructor calling:
Constructor:–
• Derived class constructor is called to create
derived class object
• Invokes base class constructor before derived
class initializer list & constructor body
Destructor:–
• Destructor are called in Reverse order of constructor
• Derived class destructor body is executed first
• Then destructors body of base class executed

25. Derived-class Object
Derived-class constructor invokes base
class constructor either
• Implicitly
• Explicitly

26. Implicit callclass B {
public:
B(){cout<<"Construct B";}
~B(){cout<<"Destruct B”; }
};
class D: public B{
public:
D(){cout<<"Construct D";}
~D(){cout<<"Destruct D";}
};
int main(){
D obj; //object of derived class
}

27. Output
Constructor B // implicitly call base class
constructor
Constructor D
Destructor D
Destructor B

28. Explicit callclass B
{ public:
int x;
B(int i) {
x=i;
cout<<“parameterize constructor B”;
}
};
Class D: public B
{ public:
int y;
D(int j) :B(j){
y=j;
cout<<“parameterize constructor D”;
}
};

29. output:
int main()
{
D obj(5); //object of derived class
cout<<obj.x<<endl;
}
Parameterize constructor B
Parameterize constructor D
5

30. When a program creates a derived-
class object
The derived-class constructor immediately calls
the base-class constructor,
The base-class constructor’s body executes,
Then the derived class’s member initializers
execute, and
Finally the derived-class constructor’s body
executes