实验四

爱被打了一巴掌 2022-01-12 08:53 274阅读 0赞

battery.h：
    #ifndef BATTERY_H
    #define BATTERY_H
    
    class Battery
    {
        
        public: 
            friend class ElectricCar;
            Battery (string a1="70km/h")
            {
                a=a1;
            }
            Battery(Battery &p);
        private:
            string a;
    };
    
     #endif
    
    
    car.h：
    
     
    
    #ifndef CAR_H
    
    #define CAR_H
    
    #include <string>
    
    #include <iostream>
    
    using namespace std;
    
    class Car{
        public:
            Car (string maker1,string model1,int year1){
                maker=maker1;
                model=model1;
                year=year1;
                odometer=0;
            };
            friend ostream &operator <<(ostream &out, Car &c);
            void updateOdometer(int odometer1){
                if(odometer>odometer1)
                {
                    cout<<"输入错误\n"; 
                }
                else
                {
                odometer=odometer1;
                }
            }; 
            friend class ElectricCar;
            
        protected:
            string maker;
            string model;
            int year;
            int odometer;
    };
    
     
    
    #endif
    
    
    electricCar.h：
    
    #ifndef  ELECTRICCAR_H
    
    #define ELECTRICCAR_H
    
    #include "car.h"
    
    #include "battery.h"
    
    class ElectricCar : public Car{
        private:
            Battery battery;
        public:
            ElectricCar(string maker2,string model2,int year2):Car(maker2,model2,year2)
            {};
            friend ostream &operator <<(ostream &out, ElectricCar &d);
            string gatbattery(){
                return battery.a;
            }
    
    };
    
    #endif
    
    
    car.cpp：
    
    #include "car.h"
    
    ostream& operator<<(ostream &out, Car &c){
        out<<"maker:"<<c.maker<<"\n"<<"model:"<<c.model<<"\n"<<"year:"<<c.year<<"\n"<<"odometer:"<<c.odometer;
        return out;
    };
    
    
    electricCar.h：
    
    #include "electricCar.h"
    
    ostream& operator<<(ostream& out, const ElectricCar& ec) {
    
        Car tmp = ec;
    
        out << tmp << endl;
    
        out << "batterySize: " << (ec.battery).getSize()<<"-kWh";
    
        return out;
    
    }
    
    
    main.cpp：
    
    #include <iostream>
    
    using namespace std;
    
     
    
    #include "car.h"
    
    #include "electricCar.h"
    
     
    
    int main() {
        // 测试Car类 
        Car oldcar("Audi","a4",2016);
        cout << "--------oldcar's info--------" << endl;
        oldcar.updateOdometer(25000);
        cout << oldcar << endl;
    
        // 测试ElectricCar类 
        ElectricCar newcar("Tesla","model s",2016);
        newcar.updateOdometer(2500);
        cout << "\n--------newcar's info--------\n"; 
        cout << newcar << endl;
    
        system("pause");
        
        return 0;
    }

转载于:https://www.cnblogs.com/hi-ypy/p/10903304.html