// inherit19.cpp  		By: Aiman Hanna -  ©1993-2005 Aiman Hanna

// This program illustrates virtual destructors. The program does not actually
// use virtual destructors; rather it illustrates when they are needed. See  
// inherit18.cpp & inherit20.cpp.


#include <iostream.h>
#include <string.h>
#include "inherit18.h"

A::A(char* s)
{
	cout << "Constructing A object \n\n";
	strA = new char[100];
	strcpy(strA, s);
};


void A::Display()
{
	cout << "Info of class A is: " << strA << endl;
}

A::~A()
{
	cout << "Destructing A, memory deletion will occur now" << endl;
	cout << "Deleting \"" << strA << "\"" << endl;
	delete []strA;
}

B::B(char* s) : A("Hello")
{
	cout << "Constructing B object \n\n";
	strB = new char[100];
	strcpy(strB, s);
};


void B::Display()
{
	cout << "Info of class B is: " << strB << endl << endl;
}

B::~B()
{
	cout << "Destructing B, memory deletion will occur now" << endl;
	cout << "Deleting \"" << strB << "\""  << endl;
	delete []strB;
}

int main()
{

	A* ptr[2];

	ptr[0] = new A("greetings from A");
	ptr[1] = new B("greetings from B");

   
	ptr[0] -> Display();
	ptr[1] -> Display();

	
	return 0;
}

// Compilation Successful
/* Output
Constructing A object

Constructing A object

Constructing B object

Info of class A is: greetings from A
Info of class B is: greetings from B
*/