cpp复习

#include<iostream>
using namespace std;
class base
{
	public:
	base(){};
	virtual void vf(){
		cout<<"base::vf()"<<endl;
	}
};
class son:public base
{
	public:
		son(){vf(); 
		};
		void g(){vf();};
		void vf(){
			cout<<"son::vf()"<<endl;
	}
};
class grandson:public son
{
	public:
		grandson(){};
		void vf(){
			cout<<"grandson::vf()"<<endl; 
		}
};
int main()
{
	grandson gs;
	gs.g();
}


#include<iostream>
using namespace std;
class base
{
	public:
	base(){};
	virtual void vf(){
		cout<<"base::vf()"<<endl;
	}
};
class son:public base
{
	public:
		son(){vf(); 
		};
		void g(){vf();};
//		void vf(){
//			cout<<"son::vf()"<<endl;
//		}
};
class grandson:public son
{
	public:
		grandson(){};
		void vf(){
			cout<<"grandson::vf()"<<endl; 
		}
};
int main()
{
	grandson gs;
	gs.g();
}

在构造函数中，优先调用自己的，但在其他函数中是根据虚函数需特性来的