{

int i;

D(int _i) : i(_i) { cout << "D::D()" << endl; }

~D() { cout << "D::~D()" << endl; }

void set(int _i) { i = _i;}

int get() const { return i; }

{

int i = 10;

int* pi = &i;

cout << "pi = " << pi << ", *pi = " << *pi << ", size = " << sizeof(pi) << endl;

cout << " size *pi =" << sizeof(*pi) << endl;

delete pi;

{

D* p1 = new D(1);

const D* p2 = new D(2);

const D* const p3 = new D(3);

D* const p4 = new D(4);

// Compile error

// p2->set(-2);

// working

p2 = p1;

cout << p2->get() << endl;

// compile error

// p3 = p1;

// p3->set(-3);

// compile error

// p4 = p1;

p4->set(-4);

cout << p4->get() << endl;

delete p1;

// delete p2;

delete p3;

delete p4;

{

D a[3] = {1, 2, 3};

D* p = a;

cout << *(p + 0) << endl;

cout << *(p + 1) << endl;

cout << *(p + 2) << endl;

{

challenge2();

return 0;