#include <iostream>
using namespace std;class Wheel{
public://成员数据string brand; //品牌int    year;  //年限//真正的成员函数void printWheelInfo(); //声明成员函数
};void Wheel::printWheelInfo()
{cout<<"我的轮胎品牌是："<<brand<<endl;cout<<"我的轮胎日期是："<<std::to_string(year)<<endl;}//在c++中一个类包含另一个类的对象叫做组合
class Car{
public://成员数据string color; //颜色string brand; //品牌string type;  //车型int    year;  //年限Wheel  wl;Wheel  *pwl;//其实也是成员数据，指针变量，指向函数的变量，并非真正的成员函数void (*printCarInfo)(string color,string brand,string type,int year);void (*CarRun)(string type);void (*CarStop)(string type);//真正的成员函数void realPrintCarInfo(); //声明成员函数
};//"::" 类或者命名空间的解析符
void Car::realPrintCarInfo()  //在类的外部进行成员函数的实现
{string  str = "车的品牌" + brand+ ",型号是" + type+ ",颜色是" + color+ ",上市年限是" + std::to_string(year);cout << str<<endl;
}int main()
{cout << "Hello World!" << endl;Car BMW3;BMW3.color = "白色";BMW3.brand = "宝马";BMW3.type  = "跑车";BMW3.year  = 2024;BMW3.wl.brand = "米其林";BMW3.wl.year  = 2024;BMW3.pwl = new Wheel;BMW3.pwl->brand = "米其林二代";BMW3.pwl->year  = 2024;BMW3.realPrintCarInfo();BMW3.wl.printWheelInfo();BMW3.pwl->printWheelInfo();return 0;
}