Virtual Destructor in C++

#include iostream.h

class Base

{

    public:

      Base(){ cout<<"Constructing Base";}

     

     // this is a destructor:

virtual ~Base(){ cout<<"Destroying Base";}

};

class Derive: public Base

{

        public:

        Derive(){ cout<<"Constructing Derive";}

       

        ~Derive(){ cout<<"Destroying Derive";}

 };

void main()

{

    Base *basePtr = new Derive();

        

        delete basePtr;

}

---------------------------------------------------------------------------------------

output

Constructing Base  

Constructing Derive 

Destroying Derive

Destroying Base

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Friend Function Demo in C++

#include<iostream.h>
#include<conio.h>
class end;
class free
{
private:
int roll;
public:
void accept();
friend void friend_demo(free f,end e);
};

void free :: accept()
{
cout<<"Enter the Roll Number :"<<endl;
cin>>roll;
}


class end
{
private :
char name[20];
public :
void accept()
{
cout<<"Enter the Name "<<endl;
cin>>name;
}
friend void friend_demo(free f,end e);
};

void main()
{
clrscr();
free f;
end e;
f.accept();
e.accept();

friend_demo(f,e);

getch();
}

void friend_demo(free f,end e)
{
cout<<"Roll number is :"<<f.roll<<endl<<"Name is "<<e.name;
}

---------------------------------------------------------------------------------------

#include<iostream.h>

#include<conio.h>

class B;

class A

{

private:

int roll;

public:

void acc()

{

cout<<"Enter roll :";

cin>>roll;

}

friend void disp(A a,B b);

};

class B

{

private:

char name[10];

public:

void acc()

{

cout<<"Enter name :";

cin>>name;

}

friend void disp(A a,B b);

};

void disp(A a,B b)

{

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

cout<<"Roll :"<<a.roll;

}

void main()

{

clrscr();

A a;

B b;

a.acc();

b.acc();

disp(a,b);

getch();

}

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Barclays Technology Centre India
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