Class is a user-defined data type in C++. It can be created to solve a particular kind of problem. After creation the user need not know the specifics of the working of a class.  

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Answered by: hirma

• Sep 18th, 2005

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class is a userdefined datatype which consists of attributes(datamembers) and behavior(member functions).Bydefault the members of a class is private.

Nikita

• Jan 23rd, 2018

Class is a user define data type which contains the variable and function which r of two type private and public where the public class members can be accessed from any other class but the private cla...

Atul

• Dec 18th, 2017

Class is same as structure in C, but in Class we have functions

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Hint FO is mechanism in which two functions r having same name with diff no. of arguments.

thash

• Feb 10th, 2018

Two or more function can have same name but different from types or number of argument.

abhi

• Jul 8th, 2017

Because it allows you to do multiple work with same function call.

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KAIRAV

• Feb 27th, 2018

NO BRO!! A member function can be defined outside the class

SomGollakota

 Profile Answers by SomGollakota Questions by SomGollakota

• Jun 13th, 2007

Assuming function is not a part of any class, and member function (obviously) is a part of a class, the difference is their scope.1. Function - is normally refered to a C-style function which has a gl...

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chethanhb  

 Profile Answers by chethanhb Questions by chethanhb

• Member Since Feb-2010 | Feb 25th, 2010

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I am one of the person who has pricked my head in understanding the above question. Let me explain in my way...

If you have virtual function or (let me take just "virtual" keyword as of now), it means that this member function can be redefined by derived class. When we have a virtual function in a class, it will have vtable (virtual table). This vtable will have the address of the virtual function which is defined in derived.
Now the point is, how you invoke the virtual function which is defined in derived class with the help of object of the class?
Once you create an object of class, vptr (virtual pointer) will be created. Which inturn will be pointing to the base address of the vtable. So now it is clear that you can invoke the virtual funtion of derived class only with an object that has created.
Now coming to virtual constructor,
If we make constructor as virtual in base, it means that it could be redefined in derived. Keep in mind that constructor is invoked during object creation (object is not created yet. still it is in the status "creating". Object will create only after executing constructor part code). Assume you are trying to create object of the class which has virtual constructor. During this process constructor of the class will be invoked. It looks for virtual keyword. Now it tries to look for virtual constructor in derived. But not possible bcz there is no vptr and no vtable avaibale at this point of time. So, when object is not created, then there is no vptr. If no vptr for this object, then how the consturtor of derived is invoked?. No address of this construtor will available in vtable.
Hence there is no point in having virtual constructor.

I believe that i have cleared your doubt.

Venkataramakrishna

• Mar 22nd, 2018

Whenever a class object is created this pointer is created just before initializing class constructor member values. If the constructor is virtual, you cannot create this pointer.

vikash tiwary

• May 11th, 2017

Virtual functions are used in order to invoke functions based on the type of object pointed by the pointer. But is not "invoked", it is called only once when it is declared. so, a constructor cannot be virtual.

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Venkataramakrishna

• Mar 22nd, 2018

Macro does not check for the data type. The inline function will check. You can enable or disable macros. in inline, depending on the requirement you can do this.

Naman

• Nov 14th, 2017

You pass some flags to the compiler to force inline or use always_inline attribute with GCC

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Krishna Kumar

• Sep 25th, 2018

There is three query for the above question, 1) Why reference object passed as parameter to the copy constructor? 2) Why pointer object is not passed as parameter to the copy constructor? 2) What r...

WinSound

 Profile Answers by WinSound Questions by WinSound

• May 31st, 2010

Copy constructor syntax:A(const A&) for the class "A"const - Indicates object passed as argument is not changed inside copy constructor so there may be 3 design possibliti...

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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

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 def...

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C++ program to expand the following string
aa2b4c3d
o/p should be :
aabbccccddd

Sai Vamshi

• Nov 25th, 2018

Code
#include <iostream>
#include<string.h>

Jin Hyuk Cho

• Feb 3rd, 2016

A working example"cpp #include #include #include #include using namespace std; string expand (string compressed) { locale loc; stringstream ss; // g...

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Khansnaina

• Sep 20th, 2019

I want implications of polymorphic use of classes

Niranjan.ambati

 Profile Answers by Niranjan.ambati Questions by Niranjan.ambati

• Apr 9th, 2009

Polymorphic means many forms. The object of the polymorphic class pointer can store any derived class objects and called respective member functions when its object member functions is called automati...

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Encapsulation.  

Navya B

• Jan 4th, 2024

Encapsulation

Ranjeet

• Feb 15th, 2023

In general, binding of data members and member function is known as encapsulation.
It means the data of that class Or object can be only access by that classs function. Its cant access by outsider function.

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