Question

求C＋＋考试题答案啊！急！急！急！

写一个程序，定义抽象基类“话费”，含有计算话费的纯虚函数，由该类派生出3个类，套餐1：数据成员为月租费20，通话时间，及每分钟话费0.2元。套餐2：数据成员为基本消费120元，超时时间及每分钟话费0.1元。套餐3：固定话费500元，不限时。用虚函数分别求各种套餐的每月话费情况，并定义基类指针数组，使每个元素指向派生类对象，输出每一种对象的话费值。在主程序中验证并给出结果。
有人在做么？在做先说句话给点希望…

Answer 1

#include <iostream>

using namespace std;

class fee{
public:
virtual double getTotalFee(int iMinutes) = 0;
};

class A : public fee{
public:
A():dRent(20.0), dFeilv(0.2){}

virtual double getTotalFee(int iMinutes)
{
return dRent += iMinutes * dFeilv;
}
private:
double dRent ;
double dFeilv ;
};

class B : public fee{
public:
B():dRent(120), iOverTime(200), dFeilv(0.1){}
virtual double getTotalFee(int iMinutes)
{
return (iMinutes>iOverTime)?(120+(iMinutes-200)*dFeilv):120.0;
}
private:
double dRent;
double dFeilv;
int iOverTime;
};

class C : public fee{
public:
virtual double getTotalFee(int iMinutes)
{
return 500.0;
}
};

int main()
{
fee *feeArray[3];
feeArray[0] = new A;
feeArray[1] = new B;
feeArray[2] = new C;
for (int i = 0;i<3; ++i) {
cout<<feeArray[i]->getTotalFee(500)<<endl;
}
return 0;
}