Chitta Ranjan Ray,TCS-KOCHI

• Nov 21st, 2006

 

Constructor is basicaly used for initialising the variables at the time of creation of object

G.Nithya

• Nov 29th, 2006

 

Use of constructor:

                      For dynamically allocating memory space.

Pushpa Siva Kumar

• Dec 14th, 2006

 

Constructor is used to initialize the member variable,when the object is created.

govind pavan

• Jan 6th, 2007

 

constructors are used for allocating memory space for variables. It is special funtion which getsactivated automatically when object of that class is created.

ravi shastry

• Jan 19th, 2007

 

constructor is automatically called when an object is created. It has no return type and it has the same name as the class.

shipra Rana

• Feb 13th, 2007

 

constructors are used to intialize the values. its name is same as that of class. it activates automatically as the class object activated. it has no return type as it returns nothing. it saves the memory space. it activates at run time

Manoj Kumar

• Mar 2nd, 2007

 

Constructor is a special member function of a class having same name as the class name.it is called at the time of creation of the object.it initialises the object.constructor can be overloaded.

dasam

 Profile Answers by dasam 

• Mar 29th, 2007

 

one more point ... constructors also used to create a vTable and initialises the vptr to NULL

burraganesh

 Profile Answers by burraganesh 

• Dec 7th, 2008

 

It automates the task of initialising objects data

Rajan

• Oct 15th, 2015

 

Constructors are of two types both of em initializes the the variables at the time of the object creation and align the memory dynamically.

Ethan

• Dec 20th, 2015

 

The constructor initializes the member variables and makes calls to the constructors of any superclasses. It also provides the programmer the opportunity to code extra funcionality into their program when an object is created. I do not beleive it dynamically allocates memory for the object, the "new" keyword is necessary for that. Otherwise the memory is allocated at compile time. It certainly gives the programmer the opportunity to dynamically allocate memory for any variables of varying size like arrays where the desired size isnt known at compile time.

Aarish

• Apr 20th, 2016

 

In class-based object-oriented programming, a constructor (abbreviation: ctor) in a class is a special type of subroutine called to create an object. It prepares the new object for use, often accepting arguments that the constructor uses to set required member variables.

Talha Bilal

• Nov 28th, 2016

 

Last sentence is very useful and any other did not describe it.

Kumar Lav

• Jun 26th, 2017

 

Constructor is generally used to initialize the member variable,when the object is created and it is automatically call by Compiler. And also Constructor is used for dynamically allocating memory space.

Code
/*  Example Program For Simple Example Program Of Constructor In C++


Fb:- kumar.lav.562


    


 


    Coded By:Kumar Lav             */


 


#include<iostream>


#include<conio.h>


 


using namespace std;


 


class Example        {


    // Variable Declaration


    int a,b;


    public:


 


    //Constructor


    Example()            {


    // Assign Values In Constructor


    a=10;


    b=20;


    cout<<"Im Constructor


";


    }


 


    void Display()    {


    cout<<"Values :"<<a<<"      "<<b;


    }


};


 


int main()                {


        Example Object;


        // Constructor invoked.


        Object.Display();


 


        // Wait For Output Screen


        getch();


        return 0;


}

Atul

• Dec 18th, 2017

 

Constructor is a function which is considered as user define function which gets implicitly called after allocating memory for object.
Writing constructor is optional.
Constructor should be written in public access specifier.
If we write as private or protected it generate error. We cannot use concept of friend, virtual, static, constant with constructor.
Basically main thing is that after calling the constructor the memory will get allocated for class characteristic.

abhinav

• Mar 3rd, 2018

 

then why do we create constructor if it is automatically created by default.

lakshminarayana k

• May 24th, 2018

 

Default constructor will be called automatically by the compiler and initialize the members to default values. If at all you want to allocate some initial values to class members other than default values then we have to write our own constructor.

Anshu Shrivastava

• Aug 27th, 2018

 

When we want to assign some values for the data member of the class then we make our own constructor.
like->
class Abc
{
int i;
};
int main()
{
Abc b1;//object of Abc class,it will call by default unparameterised constructor which will assign zero value to "i";
but if we make our own constructor with some data member value then that value will be assign
Abc::Abc()
{
i=8;//when constructor will call then the value of i will be 8
}
}

Avinash Patil

• Oct 30th, 2018

 

Constructor is a member function of a class which is used to initialize the object.
Types:
1) Copy Constructor
2) Parameterless constructor
3) Parameterrized constructor
4) Default constructor