Inheritance slides

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

Private Inheritance with private data
member

Private Inheritance with public data
members

Private Inheritance with protected
data members

Public Inheritance with public data
members

Public Inheritance with protected data
members

Public Inheritance with private data
members

Protected Inheritance with public data
members

Protected Inheritance with private
data members

Protected Inheritance with protected
data members

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

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

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

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

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

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

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

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

syntax:
Example of hierarchical inheritance:
class B : public A
class C : public A

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

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

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

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
}

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

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”;
}
};

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

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

Inheritance slides

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