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Discuss Inheritance

Types of Inheritance

Example for 5 types of Inheritance

Member function Overriding

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It is the Process of creating a Newclass from an existing class.

The Existing class is called Base orParent class.

The New class is called as Child orDerived Class

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Advantages

It permits code reusability. So, save time andincrease the program reliability.

A programmer can use a class created by anotherperson or company without modifying it derive other

classes from it that are suited to particular situations

Improve Program Reliability

It Permits code sharing

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Advantages

The base class need not be changed but can beadapted to suit the requirements in different

applications.

Saves developers time and effort so that they need

not to spend time to know the core technical facts

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Class : public

{

-------};

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Base Class

MethodsandProperties

Derived class

Base class methods+

Additional methods

Inheritance is the property that allows the

reuse of an existing class to build a new class

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Inheritance

MultilevelInheritance

Single Inheritance

Multiple Inheritance

HierarchicalInheritance

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Single InheritanceA class can be derived from a

single base class is called single inheritance

Base Class

sub Class

Multiple Inheritance

Class A

Class C

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Class A

Class B

Class C

Multilevel Inheritance

Hierarchical Inheritance

Base Class

sub Class 1sub Class 3 sub Class 2

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Hybrid Inheritance

Hybrid is nothing but the combination of Multilevel and multiple Inheritance

Lecturer

Marks Department

Student

Multi levelInheritance

MultipleInheritance

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Base ClassVisibility

Derived class Visibility

Private Not inherited Not Inherited

Public protected private

Protected public private

Public derivation Private Derivation

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//Example for Single inheritance#includeclass pcp{private:

float dos,msoffice,foxpro;public:void pcp_getfees();void pcp_listfees();

};class hdca:public pcp{private:

float unix,c,cpp;public:

void hdca_getfees();void hdca_listfees();

};void pcp::pcp_getfees(){

coutdos>>msoffice>>foxpro;}

void pcp::pcp_listfees(){cout

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It is the process of creating new class from more than one baseclasses.Syntax :class :

base_class1, base_class2...{private :

// members;protected :

// members;public ://memebers;

};

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#includeclass base1{protected :

int var1;public :

void disp_base1() {cout

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void main(){deri d(10,20,30);clrscr();d.disp_base1();d.disp_base2();d.disp_me();getch();

}

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#include

class base1{public:

int i;void disp(){cout

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//Example for MultiLevel inheritance#include#includeclass publications{

private :int book_no;public :void getdata(){cout

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Inheritance

Class Employee

Name

Age

Employee id

Salary

Department

Director

Manager

Secretary

Clerk

Common to

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Inheritance

Employee

Director Manager Secretary Clerk

Each of the sub-classes is considered to be derived from theparent class Employee

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#includeclass employee{

private :int empno;char empname[20];public :void getdata(){coutempno;coutempname;}void putdata(){cout

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void getdata(){employee::getdata();coutbasic;}void putdata(){da=0.30*basic;hra=0.15*basic;cca=0.05*basic;pf=0.12*basic;special_allowances=0.4*basic;

salary=basic+da+hra+cca+special_allowances-pf;employee::putdata();cout

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#includeclass lecturer{private :char lecturer_name[20];public :void getdata(){coutlecturer_name;}

void putdata(){cout

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#includeclass baseA{public:void show(){

cout

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The class from which members are derived are called as baseclass or parent class and the class which derives data fromanother class is called as the derived class or child class

A derived class is always as big as the base class, since theobject of the derived class inherits all the characteristics of thebase class and can add properties of its own.

Depending upon the access specifiers inheritance is classifiedas private, protected and public inheritance

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EXERCISES

1. Define Inheritance?

2. Explain with an example the specification of a derived class?

3. Explain how inheritance are classified?

4. Explain Single Inheritance with an Example?

5. Explain Multiple inheritance with an Example?

6. Explain Hierarchical Inheritance with an Example?