int main()
  {
  	matrix d(2,2), a(2,2);


  	cout<<"Podaj macierz a :\n"<< endl;
  cin>>a;
  	cout<<"Podaj macierz b :\n"<< endl;
  cin>>d;
  	cout<<"Operator -= :\n"<< endl;
  a-=d;
 cout<<a;
 matrix b=d;
cout<<b+a;

  	return 0;
  }