polymorphism ppt

MEWAR INSTITUTE OF MANAGEMENT
SUBMITTED TO: ASHEESH PANDEY SIR
SUBMITTED BY: SHEETAL SINGH
BCA 2ND YEAR
1590409046

POLYMORPHISM
• The process of representing one form in multiple forms is known
as polymorphism
• Polymorphism is derived from 2 Greek words: poly and morphs.
The word "poly" means many and morphs means forms. So
polymorphism means many forms
Real life example

HOWCAN WE ACCESS THE MEMBER OF CLASS
The member of class can be access through pointer to the
class
General syntax
P->member class;
P is pointer of object
-> is member access operator
Member class it is the member of the object

POLYMORPHISM
COMPILE TIME
POLYMORPHIS
M
RUN TIME
POLYMORPHIS
M
FUNCTION
OVERLODIN
G
OPERATOR
OVERLODIN
G
VIRTUAL
FUNCTION

COMPILE TIME POLYMORPHISM
• It is also known as static binding, early binding and overloading as
well
• It provides fast execution because known early at compile time
compile time
• Polymorphism is less flexible as all things execute at compile time.
• It is achieved by function overloading and operator overloading

COMPILE TIME POLYMORPHISM
FUNCTION OVERLOADING
• Overloading refers to the use
of the same thing for different
purpose
• Function overloading is a
logical method of calling
several function with different
datatype and argument but
name of function is the same
OPERATOR OVERLOADING
• In C++ the overloading principle
applies not only to functions, but to
operators too.
• Overloaded operator is used to
perform operation on user-defined
data type. For example '+' operator
can be overloaded to perform
addition on various data types, like
for integer, string(concatenation) etc.

RUN TIME POLYMORPHISM
• It is also known as dynamic binding, late binding and overriding as
well
• It provides slow execution as compare to early binding because it
is known at runtime
• Run time polymorphism is more flexible as all things execute at
run time.
• It is achieved by virtual functions and pointers

VIRTUAL FUNCTION
It is a special type of function
It can be declared within base class and redefine by derived class
Its name will be same in every class
In derived class it will be executed through pointer of base class
It is declared by the keyword “virtual”
A redefined function is said to override the base class function

PROGRAM RELATED
TO
VIRTUAL FUNCTION

#include<iostream.h>
class base{
public:
void display()
{cout<<“display base”;}
virtual void show()
{cout<<“nshow base”;}
};
class derived : public
base
{
public:
void display()
{cout<<“n display
derived”;}
void show()
{cout<<“n show derived”;}
};
int main()
{
base b;
derived d;
base*bptr;
cout<<“n bptr points to
base”;
bptr=&b;
bptr->display();
Bptr->show();
Cout<<“n bptr points to
derived”;
Bptr=&d;
Bptr->display();
Bptr->show();
Return 0;
}

OUTPUT
bptr points to base
display base
show case
bptr points to derived
display base
show derived

RULES OF VIRTUAL FUNCTION
• Virtual function must be member of some class
• They can’t static member
• Virtual function can be a friend of another class
• We can’t have virtual constructor but we have virtual destructor
• Virtual function is define in the base class it is not necessary to redefine in the
derived class

PURE VIRTUAL FUNCTION
• Pure virtual function give small definition to the abstract class . we
need at least one pure virtual function to create abstract class
• Pure virtual function must be define outside the function if it will
define inside the function then compiler show error

polymorphism ppt

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