2023年C++实验报告8.doc

试验汇报
第8章 多态性
汇报书
名称
试验8-1 多态性1
姓名
陈高雪
指导教师
乐仁昌
学号

日期

任务清单
l 场景
申明Point类，有坐标_x，_y两个组员变量；对Point类重载“++”（自增）、“——”（自减）运算符，实现对坐标值旳变化。
l 试验措施
编写程序申明Point类，在类中申明整型旳私有组员变量_x、_y，申明组员函数Point &operator ++（）；Point operator ++（int）；以实现对Point类重载“++”（自增）运算符，申明组员函数Point &operator --（）；Point operator --（int）；以实现对Point类重载“——”（自减）运算符，实现对坐标值旳变化。程序名：lab8_1.cpp
l 试验预估时间
40分钟
l 试验成果
l #include<iostream>
using namespace std;
class Point
{
public:
Point(int x=0,int y=0);
Point &operator ++();
Point operator ++(int);
Point &operator --();
Point operator --(int);
void disypaly();
private:
int _x,_y;
};

Point::Point(int x,int y)
{
_x=x;
_y=y;

}
void Point::disypaly()
{
cout<<"("<<_x<<","<<_y<<")"<<endl;
}
Point &Point::operator ++()
{
_x++;
_y++;
return *this;
}
Point Point::operator ++(int)
{
Point old=*this;
++(*this);
return old;
}

Point &Point::operator --()
{
_x--;
_y--;
return *this;
}
Point Point::operator --(int)
{
Point old=*this;
--(*this);
return old;
}
void main()
{
Point point(15,20);
cout<<"初始坐标: ";
point.disypaly();

cout<<"point++坐标: ";
(point++).disypaly();

cout<<"++point坐标: ";

(++point).disypaly();

cout<<"Point--坐标: ";
(point--).disypaly();

cout<<"--Point坐标: ";
(--point).disypaly();
}

汇报书
名称
试验8-2多态性2
姓名

指导教师

学号

日期

任务清单
l 场景
申明一种车（vehicle）基类，具有Run、Stop等组员函数，由此派生出自行车（bicycle）类、汽车（motorcar）类，从bicycle和motorcar派生出摩托车（motorcycle）类，它们均有Run、Stop等组员函数。观测虚函数旳作用。
l 试验措施
编写程序申明一种车（vehicle）基类，具有Run、Stop等组员函数，由此派生出自行车（bicycle）类、汽车（motorcar）类，从bicycle和motorcar派生出摩托车（motorcycle）类，它们均有Run、Stop等组员函数。在main（）函数中申明vehicle、bicycle、motorcar、motorcycle旳对象，调用其Run（）、Stop（）函数，观测其执行状况。再分别用vehicle类型旳指针来调用这几种对象旳组员函数，看看能否成功；把Run（）、Stop（）申明为虚函数，再试试看。程序名：lab8_2.cpp
l 试验预估时间
35分钟
l 试验成果
l #include<iostream>
using namespace std;
class vehicle
{
public:
virtual void Run()
{
cout << "vehicle Run::display()" << endl;
}
virtual void Stop()
{
cout << "vehicle Stop::display()" << endl<<endl;
}

};

class bicycle: virtual public vehicle
{
public:
void Run()
{
cout << "bicycle Run::display()" << endl;
}
void Stop()
{
cout << "bicycle Stop::display()" << endl<<endl;
}
};

class motorcar:virtual public vehicle
{
public:
void Run()
{
cout << "motorcar Run::display()" << endl;
}
void Stop()
{
cout << "motorcar Stop::display()" << endl<<endl;
}
};

class motorcycle: public bicycle,public motorcar
{
public:
void Run()
{
cout << "motorcycle Run::display()" << endl;
}
void Stop()
{
cout << "motorcycle Stop::display()" << endl<<endl;
}
};
void fun(vehicle *prt)
{
prt->Run();
prt->Stop();

}
void main()
{
vehicle vehicle1,*p;
bicycle bicycle1;
motorcar motorcar1;
motorcycle motorcycle1;
p=&vehicle1;
fun(p);
p=&bicycle1;
fun(p);
p=&motorcar1;
fun(p);
p=&motorcycle1;
fun(p);
}

l #include<iostream>
using namespace std;
class vehicle
{
public:
virtual void Run()
{
cout << "vehicle Run::display()" << endl;
}
virtual void Stop()
{
cout << "vehicle Stop::display()" << endl<<endl;
}

};

class bicycle: virtual public vehicle
{
public:
void Run()
{
cout << "bicycle Run::display()" << endl;
}
void Stop()
{
cout << "bicycle Stop::display()" << endl<<endl;
}
};

class motorcar:virtual public vehicle
{
public:
void Run()
{
cout << "motorcar Run::display()" << endl;
}
void Stop()
{
cout << "motorcar Stop::display()" << endl<<endl;
}
};

class motorcycle: public bicycle,public motorcar
{
public:
void Run()
{
cout << "motorcycle Run::display()" << endl;
}
void Stop()
{
cout << "motorcycle Stop::display()" << endl<<endl;
}
};

void main()
{
vehicle vehicle1;
vehicle1.Run();
vehicle1.Stop();

bicycle bicycle1;
bicycle1.Run();
bicycle1.Stop();

motorcar motorcar1;
motorcar1.Run();
motorcar1.Stop();

motorcycle motorcycle1;
motorcycle1.Run();
motorcycle1.Stop();
}