/* stuff in C++ */

using namespace std;
#include<iostream>
#include<string>


void f(int& x, int& y)
{
  int t = x;  
  x = y;
  y = t;
}

void g(int x)
{
  cout << "G\n";
}

int h()
{
  cout << "H\n";
  return 2;
}

void e(bool z, int x, int y)
{
  if (z) cout << x; else cout << y;
  cout << endl;
}

int x = 1;
int s(int y)
{
  return x+y;
}


class A
{
public:
  int x;
  int y;
  A(int x0, int y0)  { x=x0;  y = y0; }
  virtual int sum() { return x +y; }
  void print() { cout << x << " " << y << endl; }
};

class B : public A
{
public:
  int z;
  B(int x0, int y0, int z0) : A(x0,y0)
  {  z = z0; }
  int sum()
  { return A::sum() + z; }
};


int main(int argc, char** argv)
{

  int x = 2, y = 3;
  f(x,y);
  cout << x << " and " << y << endl;

  g(h()); // does it have to be this way?  ORDER OF EVAL

  x = 2;
  //  cout << 1/(x-2) << endl;
  //e(1>2, 1/(x-2), 3);

  { 
    int x = 4;
    cout << x << endl;
  }
  cout << x << endl;

  x = 2;
  cout << s(4) << endl;  // 5 or 6?

  A m = B(1,2,3);
  A *n = new B(1,2,3);
  cout << m.sum() << endl;
  cout << n->sum() << endl;  // (*n).sum()

  return 0;
}//main