第四题代码.txt（吉林大学 C++ 上机实验 参考代码）

#include<iostream>
using std::cout;
using std::endl; 
class Camera
{
private:
int version;//用于记录第几代(version)camera 
void code() { cout<<"编码算法功能启动"<<endl;}
public:
Camera():version(0) { }
Camera(int n):version(n) { }
protected:
virtual void take_photo() { cout<<"摄像功能启动！"<<endl; }
void image_set() { cout<<"图像质量设定功能启动！"<<endl;}
};
class Chip:public Camera
{
private:
bool menu;//按下menu键，启动操作菜单 
double speed;
void source_code(){cout<<"源代码输出："<<endl;}
double Speed(){return speed;}//车速传感器，返回车速 
public:
Chip(): Camera(),menu(false),speed(0.0) {} 
Chip(int ver,bool m,double s):Camera(ver),menu(false),speed(0.0) {}
Chip(const Camera & ca,bool m,double s):Camera(ca),menu(false),speed(0.0){}
void show() const {cout<<"当前车速为："<<speed<<endl;}
bool Menu() const {return menu;};//按下menu键，用于启动操作菜单
void Resetmenu(bool v) { menu=v;}
void options(){cout<<"进入操作菜单功能，请选择："<<endl;}