2013级C++第12周(春)项目——成员的訪问属性、多重继承

第一部分 程序阅读

#include <iostream>
using namespace std;
class A                   //A为基类
{
public:
void f1( );
int i;
protected:
void f2();
int j;
private:
int k;
};
class B: public A       //B为A的公用派生类
{
public:
void f3( );
protected:
int m;
private:
int n;
};

class C: public B       //C为B的公用派生类
{
public:
void f4();
private:
int p;
};

int main()
{
A a1;              //a1是基类A的对象
B b1;              //b1是派生类B的对象
C c1;              //c1是派生类C的对象
return 0;
}

#include <iostream>
using namespace std;
class A
{
public:
void f1( );
protected:
void f2();
private:
int i;
};
class B: public A
{
public:
void f3( );
int k;
private:
int m;
};
class C: protected B
{
public:
void f4();
protected:
int n;
private:
int p;
};
class D: private C
{
public:
void f5();
protected:
int q;
private:
int r;
};
int main(){
A a1;
B b1;
C c1;
D d1;
return 0;
}

第2部分 实践项目

#include <iostream>
using namespace std;
class Animal    //动物类
{
public:
Animal() {}
void eat(){
cout << "eat\n";
}
protected:
void play()
{
cout << "play\n";
}
private:
void drink()
{
cout << "drink\n";
}
};
class Giraffe: public Animal   //长颈鹿类
{
public:
Giraffe() {}
void StrechNeck()
{
cout << "Strech neck \n";
}
private:
void take()
{
eat();        // 正确。公有继承下,基类的公有成员对派生类可见
drink();      // _______________
play();       // _______________
}
};
int main()
{
Giraffe gir;      //定义派生类的对象
gir.eat();        // 正确。公有继承下,基类的公有成员对派生类对象可见
gir.play();       // _______________
gir.drink();      // _______________
gir.take();       // _______________
gir.StrechNeck(); // _______________
Animal ani;
ani.eat();        // _______________
ani.play();       // _______________
ani.drink();      // _______________
ani.take();       //错误。派生类的成员对基类对象（不论訪问属性）不可见
ani.StrechNeck(); // _______________
return 0;
}

#include <iostream>
using namespace std;
class Animal
{
public:
Animal() {}
void eat()
{
cout << "eat\n";
}
protected:
void play()
{
cout << "play\n";
}
private:
void drink()
{
cout << "drink\n";
}
};
class Giraffe: private Animal
{
public:
Giraffe() {}
void StrechNeck()
{
cout << "Strech neck \n";
}
void take()
{
eat();     // _______________
drink();   // _______________
play();    // _______________
}
};
int main()
{
Giraffe gir;
gir.eat();    // _______________
gir.play();   // _______________
gir.drink();  // _______________
return 0;
}

#include <iostream>
using namespace std;
class Animal
{
public:
Animal() {}
void eat()
{
cout << "eat\n";
}
protected:
void play()
{
cout << "play\n";
}
private:
void drink()
{
cout << "drink\n";
}
};
class Giraffe: protected Animal
{
public:
Giraffe() {}
void StrechNeck()
{
cout << "Strech neck \n";
}
void take()
{
eat();    // _______________
drink();  // _______________
play();   // _______________
}
};
int main()
{
Giraffe gir;
gir.eat();   // _______________
gir.play();  // _______________
gir.drink(); // _______________
return 0;
}

#include <iostream>
#include<conio.h>
#include <windows.h>
using namespace std;
enum vehicleStaus {rest, running};  //车辆状态：泊车、行进
class vehicle //车辆类
{
protected:
int maxSpeed;		//最大车速
int currentSpeed;	//当前速度
int weight;			//车重
vehicleStaus status; //rest-泊车状态；running-行进状态
public:
vehicle(int maxS, int w); //构造函数，初始时，当前速度总为0且处在停车状态
void start();  //由rest状态到running, 初速为1
void stop(); //由running状态到rest, 当前速度小于5时，才同意停车
void speed_up();  //加速，调用1次。速度加1
void slow_down(); //减速，调用1次，速度减1。速度为0时，停车
};

class bicycle :_____(1)_________//（1）自行车类的虚基类为车辆类
{
protected:
double height; //车高
public:
bicycle(int maxS=10, int w=50, int h=0.7);   //定义构造函数
};

class motorcar : ______(2)__________//（2）机动车类的虚基类也为车辆类
{
protected:
int seatNum; //座位数
int passengerNum; //乘客人数
public:
motorcar(int maxS=150, int w=1500, int s=5, int p=1);   //定义构造函数
void addPassenger(int p=1);   //添加搭载的乘客，超员要拒载，有人下车时，p为负数。当然车上乘客至少有1个（司机）。仅仅有车停稳后才干上下客。

};

class motorcycle: ______(3)_________ //（3）摩托车类的基类为自行车类和机动车类
{
public:
motorcycle(int maxS=90, int w=100, int s=3, int p=1, int h=0.7);//定义构造函数
void show(); //显示摩托车的执行状态
};

int main( )
{
motorcycle m;
bool end=false;
while (!end)
{
cout<<"请操作：1-启动  2-加速  3-减速  4-有人上车  5-有人下车  6-停车 0-结束"<<endl;
char keydown= _getch(); //_getch()返回键盘上读取的字符
switch(keydown)
{
case '1':
cout<<"选中的操作是1-启动\t";
m.start();
break;
case '2':
cout<<"选中的操作是2-加速\t";
m.speed_up();
break;
case '3':
cout<<"选中的操作是3-减速\t";
m.slow_down();
break;
case '4':
cout<<"选中的操作是4-有人上车\t";
m.addPassenger();
break;
case '5':
cout<<"选中的操作是5-有人下车\t";
m.addPassenger(-1);
break;
case '6':
cout<<"选中的操作是6-停车\t";
m.stop();
break;
case '0':
end=true;
break;
}
m.show();
cout<<endl;
Sleep(200);  //要包括头文件<windows.h>
}
return 0;
}

int main()
{
TimeDate dt_a,dt_b(2010,4,16,9,30,0);
cout<<"dt_a: ";
dt_a.PrintDate_Time();
cout<<endl;
cout<<"dt_b: ";
dt_b.PrintDate_Time();
dt_a.SetTime(20,00,00);
dt_a.SetDate(2008,8,7);
cout<<endl;
cout<<"dt_after uptate: ";
dt_a.PrintDate_Time();
return 0;
}

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