Constructors are special member functions used to initialize objects. There are three types of constructors: 1) default constructors which have no arguments, 2) parameterized constructors which can take arguments to initialize objects, and 3) copy constructors which initialize an object from another existing object. Constructors are automatically called when objects are created, take the class name, and cannot return values or be defined as private. They play an important role in initializing class objects.

1. 
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G.H PATEL COLLEGE OF
ENGINEERING AND TECHNOLOGY
TOPIC : CONSTRUCTOR AND ITS TYPES
SUBJECT : OBJECT ORIENTED PROGRAMMING WITH C++ (2140705)
PREPARED BY : TEJOY VACHHRAJANI (160110116057)
BHAVIK VASHI (160110116061)
KHYATI VALERA (160110116059)
SUBMITTED TO : PROF. BHARGESH PATEL
CLASS : B.E. IT (2ND YEAR)
BATCH : 1D16

2. 
2
CONSTRUCTOR FUNCTION

3. Everthought that what kind of
problems cananobject create if it’s
not initialised.
It’s similar togiving your vehiclethe final gear
just during thestartup.

4. TheObject
What if user
didn’t assignme
any value initially
(by chance he
forget) andfinally
askme myvalue?
I’ll behelpless.
Soto makea
program
robust the
object should
be initialised
every time.
And in classwe do this byconstructors...

5. •Well! It is aspecial member function that
is used for initialization of objects (data
members).
•A constructor function is called
whenever anobject is created.
•Constructors are also called when an
object is created as a part of another
object.
What is “ Constructor ” !!!

6. 
 Constructor Functions have “same name” as
that ofclassname.
 Theydo not havereturn types, not even void.
 May or maynothave parameters.
C++has default constructors that are called
whenever a class is declared even if no
function with the samenameexists
Some of it’s characteristics
Mind It!

7. 
Theyshould be declared in“public section”.
Theyare invoked “automatically”when
objects arecreated.
We cannot call it for the already
constructed object.
Some of it’s characteristics

8. 
 THERE ARE 3 TYPES OF CONSTRUCTORS:-
 1. DEFAULT CONSTRUCTOR
 2. PARAMETER CONSTRUCTOR
 3. COPY CONSTRUCTOR
TYPES OF CONSTRUCTORS

9. 
DEFAULT CONSTRUCTOR
 Becausein C++default constructor isthere.
 Thisconstructor hasno argumentsin it.
 Default Constructor is also called as no
argumentconstructor.

10. 
DEFAULT CONSTRUCTOR
 Default argument is an argument to a function that a
programmer isnot required to specify.
 C++ allow the programmer to specify default arguments
that always have avalue, even if one isnot specified when
calling the function.
 For example, in the following function
declaration:
i n t MyFunc (int a, int b, int c=12) ;

11. 

12. 
PARAMETER CONSTRUCTOR
 A parameterized constructor is just one that
hasparameters specified in it.
 We can pass the arguments to constructor
function when objectare created.
 A constructor that can take arguments are
called parameterizedconstructors.

13. 

14. 

15. 
COPY CONSTRUCTOR
 CopyConstructor is used to declare and
initializeanobject from another object.
 For example thestatement:
abc c2(c1);
 would define the object c2and at thesame time
initializeit to the valueof c1.
 Theprocess of initializing through acopy
constructor isknown ascopy initialization.

18. 
SOMETHING IMPORTANT
 Automatically called an objectis
when created.
 Wecandefine our ownconstructors
 A constructor takes the same name as the class
name.
 Wecan’t define a constructor in the
private section.