C++ 多态 作业.doc

多态性 1、2题针对“7继承与派生”中的两个题目，请修改程序，使其运用多态特性。 (1) #include stdafx.h #include iostream.h #include iomanip.h #include string.h class Date { private: int year,month,day; public: Date(){} Date(int y,int m,int d){year=y;month=m;day=d;} void setDate(int y,int m,int d){year=y;month=m;day=d;} int getYear(){return year;} int getMonth(){return month;} int getDay(){return day;} ~Date(){} }; class Vehicle { protected: Date date; float price; public: Vehicle(){} Vehicle(int y,int m,int d,float p); void setPrice(float p){price=p;} virtual void show(); ~Vehicle(){cout基类析构函数被调用！endlendl;} }; Vehicle::Vehicle(int y,int m,int d,float p):date(y,m,d) { price=p; cout基类构造函数被调用！endlendl; } void Vehicle::show() { cout机动车Vehicle类：endlendl; } class Car:public Vehicle { private: int person; public: Car(){} Car(int y,int m,int d,float p,int pn); void setPerson(int pn){person=pn;} int getPerson(){return person;} void show(); ~Car(){cout派生类Car类析构函数被调用！endlendl;} }; Car::Car(int y,int m,int d,float p,int pn):Vehicle(y,m,d,p) { person=pn; cout派生类Car类构造函数被调用！endl; } void Car::show() { coutCar类：endl; cout出厂日期：date.getYear()年date.getMonth()月date.getDay()日endl; cout售价：price元endl; cout乘客数量:person人endl; coutendl; } class Truck:public Vehicle { private: int thing; public: Truck(){} Truck(int y,int m,int d,float p,int tn); void setPerson(int tn){thing=tn;} int getPerson(){return thing;} void show(); ~Truck(){cout派生类Truck类析构函数被调用！endlendl;} }; Truck::Truck(int y,int m,int d,float p,int tn):Vehicle(y,m,d,p) { thing=tn; cout派生类Truck类构造函数被调用！endl; } void Truck::show() { coutTruck类：endl; cout出厂日期：date.getYear()年date.getMonth()月date.getDay()日endl; cout售价：price元endl; cout载重吨数:thing吨endl; coutendl; } void main() { int i; Vehicle *vehicle[3]; Vehicle v(0,0,0,0); vehicle[0]=v; int y,m,d; cout请输入car的出厂日期（年，月，日）:endl; cinymd; float p; cout请输入car的售价(元):endl; cinp; int pn; cout请输入car的乘客数量(人):endl; cinpn; coutendl; Car c(y,m,d,p,pn); vehicle[1]=c; coute