#include <iostream>

class A
{
public:
  A () : a(5), b(6) {}
  A (int _a, int _b) : a (_a), b(_b) {}
  A& operator= (const int& right) { a = right + b; };
  void print() { std::cout << "a=" << a << "; b=" << b << std::endl; }

private:
  int a;
  int b;
};

class B : public A
{
public:
  B () : A (10, 20) {}
};


int main ()
{
  A aaa;
  aaa=20;
  aaa.print ();
  B bbb;
  bbb=150;
  bbb.print();
  return 0;
}