Polymorphism in c++(ppt)

Haldia Institute of Technology
Presented By : -
Name Roll no.
Purabi Biswas 14/CS/70
Sanjit Shaw B14/CS/127
Shubham Singhanaia B14/CS/127
(Computer Science & Engineering)

POLYMORPHISM
The process of representing one Form in multiple forms is
known as Polymorphism. Here one form represent original
form or original method always resides in base class and
multiple forms represents overridden method which resides in
derived classes.
Polymorphism is derived from 2 Greek words: poly and
morphs. The word "poly" means many and morphs means
forms.

Real life example of Polymorphism
Suppose if you are in class room that time you behave
like a student, when you are in market at that time you
behave like a customer, when you at your home at that
time you behave like a son or daughter, Here one person
have different-different behaviors.

Type of Polymorphism
 Static polymorphism is also known as early binding and compile-time polymorphism.
In static polymorphism memory will be allocated at compile-time.
 Dynamic polymorphism is also known as late binding and run-time polymorphism. In
dynamic polymorphism memory will be allocated at run-time.
Polymorphism
Static
Function
Overloading
Operator
Overloading
Dynamic
Virtual
Functions

Method Overloading
Whenever same method name is exiting multiple times in the same class with
different number of parameter or different order of parameters or different types of
parameters is known as method overloading.
In next example method "sum()" is present in Addition class with same name but
with different signature or arguments.

Function Overloading Example
class Addition {
public: void sum(int a, int b) {
cout<<"a+b :"<<a+b; } //output :- a+b : 30
void sum(int a, int b, int c) {
cout<<"a+b+c :"<<a+b+c; } //output :- a+b+c : 60
};
int main() {
Addition obj;
obj.sum(10, 20);
cout<<endl;
obj.sum(10, 20, 30); }

Operator Overloading
The process of making an operator to exhibit different behaviors in different
instances is known as operator overloading.
Only predefined operator can be overloaded.
Types Of Operator Overloading
Unary operator overloading.
These Operators have only single operand.
Examples:- ++,--,~,!
Binary operator overloading.
These operators can have two or more operands.
Examples:-+,-,*,/,%,^,=,==,+=,&,&& etc

Operator Overloading Example
class complex{ int main(){
private:: complex c1,c2,c3;
int a,b; c1.set_data(3,4);
public:void set_data(int x,int y){ c2.set_data(5,6);
a=x;b=y;} c3=c1.add+(c2);
void show_data(){ c3.show_data();
cout<<“n a=“<<a<<“b=“<<b;} return 0;}
complex add+(complex c){
complex temp ;
temp.a=a+c.a;
temp.b=b+c.b;
return temp;}};

Virtual Function
A virtual function is a member function that is declared as virtual within a base
class and redefined by a derived class.
 To create virtual function, precede the base version of function’s declaration with
the keyword virtual.
 Here we use a pointer to the base class to refer to all the derived objects.
 The method name and type signature should be same for both base and derived
version of function.

Using Virtual Keyword Example
class A {
public: virtual void show() {
cout<<"Content of base class.n"; }};
class B : public A {
public: void show() {
cout<<"Content of derived class.n"; } };
int main() {
A b,*bptr; //Base class pointer
B d; //Derived class object
bptr = &b;
bptr->show(); //Late Binding Occurs
Bptr=&d;
Bptr->show();
return 0; }

Special Thanks To:-
Mrs. Rajrupa Metia
(Asst. Professor)
Computer Science & Engineering

Polymorphism in c++(ppt)

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