// ============================================
// Week 8: Classes (I) (p. 11)

class MyVector
{
  int n; 
  int* m; 
  void init(int dim); 
  void print(); 
};
void MyVector::init(int dim)
{
  n = dim;
  m = new int[n]; 
  for(int i = 0; i < n; i++)
    m[i] = 0;
}
void MyVector::print()
{
  cout << "(";
  for(int i = 0; i < n - 1; i++)
    cout << m[i] << ", ";
  cout << m[n-1] << ")\n";
}
int main()
{
  MyVector v;
  v.init(5);
  delete [] v.m;
  return 0;
}








// ============================================
// Week 8: Classes (I) (p. 13)

class MyVector
{
private:
  int n; 
  int* m; 
public:
  void init(int dim); 
  void print(); 
};

int main()
{
  MyVector v;
  v.init(5); // fine
  v.n = 3; // compilation error!
  delete [] v.m;
  return 0;
}







// ============================================
// Week 8: Classes (I) (p. 18)


class MyVector
{
private:
  int n; 
  int* m; 
public:
  void init();
  void init(int dim); 
  void init(int dim, int value);  
  void print(); 
};

void MyVector::init()
{
  n = 0;
  m = NULL;
}
void MyVector::init(int dim)
{
  init(dim, 0);
}
void MyVector::init(int dim, int value)
{
  n = dim;
  m = new int[n]; 
  for(int i = 0; i < n; i++)
    m[i] = value;
}






// ============================================
// Week 8: Classes (I) (p. 25)

class MyVector
{
private:
  int n; 
  int* m; 
public:
  MyVector();
  MyVector(int dim, int value = 0);  
  void print(); 
};

MyVector::MyVector()
{
  n = 0;
  m = NULL;
}
MyVector::MyVector(int dim, int value)
{
  n = dim;
  m = new int[n]; 
  for(int i = 0; i < n; i++)
    m[i] = value;
}






// ============================================
// Week 8: Classes (I) (p. 26)

int main()
{
  MyVector v1(1);
  MyVector v2(3, 8);
  v1.print(); // (0)
  v2.print(); // (8, 8, 8)
  // memory leak
  return 0;
}






// ============================================
// Week 8: Classes (I) (p. 29)

class A
{
public:
  A() { cout << "A\n"; }
  ~A() { cout << "a\n"; }
};

class B
{
private:
  A a;
public:
  B() { cout << "B\n"; }
  ~B() { cout << "b\n"; }
};

int main()
{
  B b;
  return 0;
}