Constructor and destructor are special types of methods in object-oriented programming. Constructors are used to initialize objects and are called when an object is created, while destructors are used to destroy objects and are called when an object is deleted or goes out of scope. There are different types of constructors like default, parameterized, and copy constructors. Constructors cannot be inherited or virtual. Destructors are used to clean up resources used by an object and are called automatically when an object is destroyed. The key differences between constructors and destructors are that constructors initialize objects and can have parameters, while destructors destroy objects and have no parameters.

1. Constructor and Destructor in OOP
Qazi Abdul Samad
Presented By

2. Contends
Constructor
Concept of Constructor in OOP
Characteristic of Constructor
Types of Constructor
Constructor Overloading
Destructor
Charactersticks of Destructor
Concept of Destructor in OOP
Difference Between Constructor and Destructor

3. Constructor
 Constructor is a special type of method that is invoked when
you create a new instance of a class.
 constructor is used to initialize the members of the class.the
name of the constructor is same as the name of the class that
contains it.

4. Concept of Constructor in OOP
 A constructor is a special member function whose task to
initialize the object of that class.
 it is speacial because its name is the same as the class name.
 constructor is invoked whenever an object of the associated is
class is created.
 it is called constructor because it construct the values of data
member of the class.

5. Characteristic of Constructor
 They cannot be inherited, though a derived class can call the base
class constructor.
 Like other C++ functions, Constructors can have default
arguments.
 Constructors can not be virtual.
 We can not refer to their addresses.
 They make ‘implicit calls’ to the operators new and delete when
memory allocation is required.

6. Types of Constructor
1. Default Constructor :
A constructor that accepts no parameters is called
Default Constructor.
2. Parameterized Constructor :
The constructor that can take arguments is called as
Parameterized Constructor.
3. Copy Constructor :
A constructor can accept a reference to its own class
as a parameter which is called Copy Constructor

7. Example of Default Constructor ;

8. Example of Parameterized
constructor ;

9. Example of Copy constructor;

10. Constructor Overloading
 The process of declaring multiple constructor with the same
name but different parameters is known as constructor
overloading.
 the constructor with same name must differ in one of the
following ways
1. number of parameters
2. type of parameters
3. sequence of parameters
 its covenient to be able to gives values to member variables of
a class when the objects is created.

11. Example

12. Destructor
A destructor, as the name implies is used to destroy the objects
that have been created by a constructor.
Like a constructor the destructor is also a special member
function whose name is the same as the class name but is
preceded by a tilde (~).
A destructor never takes any argument nor does it return any
value.
Example the destructor for the class integer can be defined as
shown below
~integer( ) { }

13. Example of Destructor

14. Characteristic OF Destructor
 Destructor function are invoked automatically when the objects
are destroyed.
 if the class has a destructor each object of that class will be de-
intialized before the objects goes out of scope.
 destructor function obeys the usual access rules.
 no arrguments can be provided to a destructor neither does it
returns any value.
 they can not be inherited.
 a destructor may not be static..

15. Difference Between Constructor &
Destructor

16. The End
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