// Example of struct subtyping
#include <iostream>

using namespace std;

struct a {
  int x;

  a(){};
  a(int i): x(i) {}
  a(const a &arg): x(arg.x) {}

  void print();
  void super() { cout<<"super"<<endl; }
  };

struct b:a {
  int y;

  b(){};
  b(int i,int j): a(i),y(j) {}
  b(const b &arg): a(arg.x),y(arg.y) {}

  void print();
  };

void a::print() {
  cout<<x<<' ';
  }

void b::print() {
  //((a*) this)->print();
  a::print();
  cout<<y<<' ';
  }

int main() {
  a c(111),q;
  b d(222,333),r;

  c.print();
  cout<<endl;
  d.print();
  cout<<endl;

  q.x=444;
  r.x=555;
  r.y=666;
  q.print();
  cout<<endl;
  r.print();
  cout<<endl;
  q.super();
  r.super();
  cout<<"sizeof(q) "<<sizeof(q)<<endl;
  cout<<"sizeof(r) "<<sizeof(r)<<endl;
  }