Problem B: 驾驶员与汽车

Problem B: 驾驶员与汽车

Description

我们知道，目前我国的驾照大致可分为A、B、C三种，其中C证只能开小型客车（货车），B证可开中、小型客车（货车），A证没有限制。现在请定义如下几个类：

1. Automobile：抽象类，具有数据成员double speed，纯虚函数virtual void run() const = 0。

2. 六种车型，即小型车Benz、Buick；中型车Zhongba、Beiqi；以及大型车Dayu、Jianghuai。它们都是Automobile的子类。

3. Driver类，具有string name和char type两个数据成员，前者是司机的名字，后者是司机持有的驾照类型（A、B或C）。提供Drive(Automobile *)方法，根据驾照类型判定该司机是否可以驾驶指定的汽车。

Input

输入分多行。第一行是一个整数M>0，表示之后有M个测试用例。

每个测试用例包括四部分：司机姓名（不含空白符）、驾照类型（A、B或C）、车型（分别用字母a~f表示六种车型，对应的车型可以从main()中看出）以及该车的行驶速度（double类型范围内的正数）。

Output

输出共M行，每个测试用例对应一行输入，具体格式参见样例。

HINT

1.使用typeid来判定一个基类指针实际指向的对象的类型。

2.注意：append.cc中已经给出了Driver类的一个方法，不要在Driver类重复定义了。

#include <iostream>#include <typeinfo>#include <string>#include <iomanip>using namespace std;class Automobile {protected:    double speed;public:    Automobile(double s) : speed(s) {}    virtual void run() const = 0;    virtual ~Automobile() {        cout << "An automobile is erased!" << endl;    }};class Benz : public Automobile {public:    Benz(double speed) : Automobile(speed) {}    ~Benz() {        cout << "A Benz is erased!" << endl;    }    void run() const {        cout << setprecision(2) << setiosflags(ios::fixed);        cout << "Benz at speed of "<<speed<<"km/h." << endl;    }};class Buick : public Automobile {public:    Buick(double speed) : Automobile(speed) {}    ~Buick() {        cout << "A Buick is erased!" << endl;    }    void run() const {        cout << setprecision(2) << setiosflags(ios::fixed);        cout << "Buick at speed of "<<speed<<"km/h." << endl;    }};class Zhongba : public Automobile {public:    Zhongba(double speed) : Automobile(speed) {}    ~Zhongba() {        cout << "A Zhongba is erased!" << endl;    }    void run() const {        cout << setprecision(2) << setiosflags(ios::fixed);        cout << "Zhongba at speed of "<<speed<<"km/h." << endl;    }};class Beiqi : public Automobile {public:    Beiqi(double speed) : Automobile(speed) {}    ~Beiqi() {        cout << "A Beiqi is erased!" << endl;    }    void run() const {        cout << setprecision(2) << setiosflags(ios::fixed);        cout << "Beiqi at speed of "<<speed<<"km/h." << endl;    }};class Dayu : public Automobile {public:    Dayu(double speed) : Automobile(speed) {}    ~Dayu() {        cout << "A Dayu is erased!" << endl;    }    void run() const {        cout << setprecision(2) << setiosflags(ios::fixed);        cout << "Dayu at speed of "<<speed<<"km/h." << endl;    }};class Jianghuai : public Automobile {public:    Jianghuai(double speed) : Automobile(speed) {}    ~Jianghuai() {        cout << "A Jianghuai is erased!" << endl;    }    void run() const {        cout << setprecision(2) << setiosflags(ios::fixed);        cout << "Jianghuai at speed of "<<speed<<"km/h." << endl;    }};class Driver {private:    string name;    char type;public:    Driver(string s, char c) : name(s), type(c) {}    void Drive(Automobile *);};void Driver::Drive(Automobile *automobile){    switch (type)    {    case 'A':        cout<<"Driver "<<name<<" can drive ";        automobile->run();        break;    case 'B':        if (typeid(*automobile) == typeid(Dayu) || typeid(*automobile) == typeid(Jianghuai))            cout<<"Driver "<<name<<" cannot drive large bus."<<endl;        else        {            cout<<"Driver "<<name<<" can drive ";            automobile->run();        }        break;    case 'C':        if (typeid(*automobile) != typeid(Benz) && typeid(*automobile) != typeid(Buick))            cout<<"Driver "<<name<<" cannot drive bus."<<endl;        else        {            cout<<"Driver "<<name<<" can drive ";            automobile->run();        }        break;    }}int main(){    string name;    char type;    double speed;    char automobileType;    int cases;    Automobile *automobile;    cin>>cases;    for (int i = 0; i < cases; i++)    {        cin>>name>>type>>automobileType>>speed;        Driver driver(name, type);        switch (automobileType)        {        case 'a':            automobile = new Benz(speed);            break;        case 'b':            automobile = new Buick(speed);            break;        case 'c':            automobile = new Zhongba(speed);            break;        case 'd':            automobile = new Beiqi(speed);            break;        case 'e':            automobile = new Dayu(speed);            break;        case 'f':            automobile = new Jianghuai(speed);            break;        }        driver.Drive(automobile);        delete automobile;    }    return 0;}