class A
{
 public:
 int i;
 protected:
 int j;
 privat:
 int k;
};
class B:public:A//private:A 父类所有成员到子类中全部变为private 孙类无法调用 protected:A 父类public protected 变为protected 孙类可以调用
{
	public:
	cout<<i;//ok
	cout<<j;//ok
	cout<<k;//error
}