Problem C: 不同交通工具的速度

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Problem C: 不同交通工具的速度

Time Limit: 1 Sec Memory Limit: 128 MB
Submit: 1685 Solved: 765
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Description

不同交通工具的速度是不同的。针对自行车、摩托车和汽车分别建立类，来模拟这一情况。

定义Vechicle类，是所有交通工具的父类：

1. 属性int speed表示交通工具的一般速度。

2. 静态数据成员int numOfVechicles，表示创建的交通工具的数量。这个值只增不减。

3. 静态成员函数int getNumOfVechicles()，用于获取交通工具的数量。

4. 析构函数。输出“A vechicle is deleted.”

5. 纯虚函数void show().

定义Bike、MotoBike和Car三个类，它们都是Vechicle的子类，且具有：

1. 构造函数。

2. 重写show()函数，输出“A *'s speed is ？ km/h.”，其中“*”是bike、motobike或car，根据所在类不同而不同。“？”是speed属性的值。

3. 析构函数。输出“A * is deleted.”，“*”的含义同上。

定义Person类，表示司机：

1. 数据成员string name，是人的姓名。

2. void drive(Vechicle&)方法，输出“$ drives”，并调用Vechicle类的show()方法。其中“$”是name的值。

Input

第1行N>0，表示有N个测试用例。

每个测试用例包括一个不含空白符的字符串、一个字符和一个整数。

Output

见样例及题目描述。

Sample Input

3Tom B 15Jack M 50Mary C 100

Sample Output

In beginning, we have 0 vechicles.Tom drives. A bike's speed is 15km/h.A bike is deleted.A vechicle is deleted.Jack drives. A motobike's speed is 50km/h.A motobike is deleted.A vechicle is deleted.Mary drives. A car's speed is 100km/h.A car is deleted.A vechicle is deleted.At the end, we have 3 vechicles.

#include <bits/stdc++.h>using namespace std;class Vechicle{public:    int speed;    Vechicle(int speed):speed(speed){numOfVechicle++;}    static int numOfVechicle;    static int getNumOfVechicles()    {        return numOfVechicle;    }    virtual void show()=0;    virtual~Vechicle(){cout<<"A vechicle is deleted."<<endl;}};class Bike:public Vechicle{public:    Bike(int _s):Vechicle(_s){}    void show()    {        cout<<"A bike's speed is "<<speed<<"km/h."<<endl;    }    ~Bike(){cout<<"A bike is deleted."<<endl;}};class MotoBike:public Vechicle{public:    MotoBike(int _s):Vechicle(_s){}    void show()    {        cout<<"A motobike's speed is "<<speed<<"km/h."<<endl;    }    ~MotoBike(){cout<<"A motobike is deleted."<<endl;}};class Car:public Vechicle{public:    Car(int _s):Vechicle(_s){}    void show()    {        cout<<"A car's speed is "<<speed<<"km/h."<<endl;    }    ~Car(){cout<<"A car is deleted."<<endl;}};class Person{public:    string name;    Person(string name):name(name){}    void drive(Vechicle &v){cout<<name<<" drives. ";v.show();}};int Vechicle::numOfVechicle=0;int main(){    int cases, n;    char c;    string name;    Vechicle* vechicle;    cout<<"In beginning, we have "<<Vechicle::getNumOfVechicles()<<" vechicles."<<endl;    cin>>cases;    for (int i = 0; i < cases; i++)    {        cin>>name>>c>>n;        Person person(name);        switch (c)        {        case 'B':            vechicle = new Bike(n);            break;        case 'M':            vechicle = new MotoBike(n);            break;        case 'C':            vechicle = new Car(n);            break;        }        person.drive(*vechicle);        delete vechicle;    }    cout<<"At the end, we have "<<Vechicle::getNumOfVechicles()<<" vechicles."<<endl;    return 0;}

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