#include <iostream>
using namespace std;

class a{
public:
	int *x;

	// default constructor
	a():x(new int[10]){
		for(int i = 0; i < 10; i++)
			x[i]=i+1;
	}

	// copy constructor
	a(a &z){
		x = new int[10];
		for(int i = 0; i < 10; i++)
			x[i] = z.x[i];
	}

	// without copy constructor deletes twice blows up
	~a(){delete []x;}
};

void main(){
	a test, test2(test);
	test2.x[0] = 17;

	/* demonstration of using deleted memory
	int *p = new int(3);
	cout << *p << endl;
	delete p;
	cout << *p << endl;
	p = 0;
	cout << *p << endl;
    */

	// without copy constructor prints 17
	cout << test.x[0] << endl;  
}