Problem A: 驾驶员与汽车
Time Limit: 1 Sec Memory Limit: 128 MBSubmit: 2277 Solved: 939
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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。
Sample Input
Sample Output
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<algorithm>
#include<cstdio>
#include<cctype>
#include<cstring>
#include<cstdlib>
#include<sstream>
#include<iomanip>
using namespace std;
class Automobile
{
public:
double speed;
Automobile(double speed=0):speed(speed){}
virtual void run()const = 0;
virtual ~Automobile(){cout<<"An automobile is erased!"<<endl;}
};
class Benz:public Automobile
{
public:
double speed;
Benz(double speed=0):speed(speed){}
void run()const{cout<<setiosflags(ios::fixed)<<"Benz at speed of "<<setprecision(2)<<speed<<"km/h."<<endl;}
virtual ~Benz(){cout<<"A Benz is erased!"<<endl;}
};
class Buick:public Automobile
{
public:
double speed;
Buick(double speed=0):speed(speed){}
void run()const{cout<<setiosflags(ios::fixed)<<"Buick at speed of "<<setprecision(2)<<speed<<"km/h."<<endl;}
virtual ~Buick(){cout<<"A Buick is erased!"<<endl;}
};
class Zhongba:public Automobile
{
public:
double speed;
Zhongba(double speed=0):speed(speed){}
void run()const{cout<<setiosflags(ios::fixed)<<"Zhongba at speed of "<<setprecision(2)<<speed<<"km/h."<<endl;}
virtual ~Zhongba(){cout<<"A Zhongba is erased!"<<endl;}
};
class Beiqi:public Automobile
{
public:
double speed;
Beiqi(double speed=0):speed(speed){}
void run()const{cout<<setiosflags(ios::fixed)<<"Beiqi at speed of "<<setprecision(2)<<speed<<"km/h."<<endl;}
virtual ~Beiqi(){cout<<"A Beiqi is erased!"<<endl;}
};
class Dayu:public Automobile
{
public:
double speed;
Dayu(double speed=0):speed(speed){}
void run()const{cout<<setiosflags(ios::fixed)<<"Dayu at speed of "<<setprecision(2)<<speed<<"km/h."<<endl;}
virtual ~Dayu(){cout<<"A Dayu is erased!"<<endl;}
};
class Jianghuai:public Automobile
{
public:
double speed;
Jianghuai(double speed=0):speed(speed){}
void run()const{cout<<setiosflags(ios::fixed)<<"Jianghuai at speed of "<<setprecision(2)<<speed<<"km/h."<<endl;}
virtual ~Jianghuai(){cout<<"A Jianghuai is erased!"<<endl;}
};
class Driver
{
public:
string name;
char type;
void Drive(Automobile *);
Driver(string name,char type):name(name),type(type){}
~Driver(){}
};
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;
}