Computer programming C++

Dear Praveen,

Pure virtual functions are used to create Abstract classes - class in which objects can't be created and act as only a 'prototype', which is used as a base class.

Another main use of PVF is to 'force' the derived class to define its own function definition. The pure virtual function can have statements too!, in which case the derived class can call the base class' function with the use of scope resolution (::).

Eg: The base class Shape contains all the 'basic function' with some common code. The derived classes - rectange - can overload to define its own funtion.

class shape
{
virtual void print(void) =0 // =0 means it is a pure virtual function
{
cout }
};

class rectange : public shape
{

float length,breadth;

rectangle()
{
length=10;
breadth=20;
}

void print(void)
{
shape::print();
cout cout }
};

void main(void)
{
shape s; // Error
rectange r; // Fine!

r.print();
}

OUTPUT:

Base class
Derived class
10 20

Google it and you will land in a sea of links.

Hello,

     C++ is not different as C.Then before start coding firstly you you understood object, method, class and other Which are related with the Program.

Thanks:

hytechpro

Which kind of C++ do you like to learn?

According to my experience, there're 3 kind of C language: Borland C, VC,Turbo C. And I believe it firmly that there's not only one kind of C++. Different developmet environments make the different syntax and standards