Virtual Class Base Examples :)

1) Simple Example of virtual class 

 #include<fstream.h>

#include<conio.h>

class base

{

    public:

    virtual void show()=0;

};

class derived1 : public base

{

    public:

    void show()

    {

        cout<<"\n Mahi 1";

    }

};

class derived2 : public base

{

    public:

    void show()

    {

        cout<<"\n Mahi 2";

    }

};

void main()

{

    clrscr();

    base *b;

    derived1 d1;

    derived2 d2;

    b = &d1;

    b->show();

    b = &d2;

    b->show();

    getch();

}

Here is the output :)

 2) Virtual class example of student details

#include<conio.h>
#include<iostream.h>
class base
{
    public:

    virtual void input()=0;

    virtual void output()=0;
};
class derived:public base
{
    char name[15];
    int roll_no,age;

    public:

        void input()

        {

            cout<<"Enter name of the student: ";
            cin>>name;

            cout<<"Enter roll no of the student: ";
            cin>>roll_no;

            cout<<"Enter age of the student: ";
            cin>>age;
        }

        void output()
        {

            cout<<"Name: "<<name<<endl;

            cout<<"Roll no: "<<roll_no<<endl;

            cout<<"Age: "<<age<<endl;

        }
};
void main()
{
    base *ptr;
    derived d1;
    clrscr();
    ptr=&d1;
    ptr->input();
    cout<<"Data of student is: "<<endl;
    ptr->output();
    getch();
}

Here is the output :)