class point1  
{
public:
 point1();
 point1(int i);
 virtual ~point1();
private:
  int x;   
};
point1::point1()
{
   x=1;
   cout<<"point1's default constructor called!\n";
}
point1::point1(int i)
{ 
 x=i;
    cout<<"point1's  constructor called!\n";
}
point1::~point1()
{
}
 
 
class point2 : public point1  
{
public:
 point2();
 point2(int i,int j,int k);
 virtual ~point2();
 point1 p;
};
point2::point2() 
{
    cout<<"point2's defaule constructor called\n";
}
point2::point2(int i,int j,int k)
{
 cout<<"point2's constructor called\n";
}
point2::~point2()
{
}
 
 
//主函数
void main()
{
   point2 pp;
   point2 pp1(1,2,3);
}

point1's default constructor called!// point1 p;调用了基类默认构造函数
point1's default constructor called!//
point2's defaule constructor called
point1's default constructor called!// point1 p;调用了基类默认构造函数
point1's default constructor called!
point2's constructor called

point2::point2(int i,int j,int k)
{
 cout<<"point2's constructor called\n";
}

point2::point2(int i,int j,int k):p(j)
{
 cout<<"point2's constructor called\n";
}

point1's default constructor called!
point1's default constructor called!
point2's defaule constructor called
point1's default constructor called!
point1's  constructor called!
point2's constructor called