#include <iostream>
using namespace std;

// Boat类定义
class Boat {
private:
    double weight;  // Boat的重量，使用double以支持小数

public:
    // Boat的构造函数
    Boat(double w) : weight(w) {}

    // Boat的析构函数
    ~Boat() {
        cout << "boat is destruction" << endl;
    }

    // 获取Boat的重量
    double getWeight() const {
        return weight;
    }
};

// Car类定义
class Car {
private:
    double weight;  // Car的重量，使用double以支持小数

public:
    // Car的构造函数
    Car(double w) : weight(w) {}

    // Car的析构函数
    ~Car() {
        cout << "car is destruction" << endl;
    }

    // 获取Car的重量
    double getWeight() const {
        return weight;
    }
};

// 友元函数，计算Boat和Car的重量和
double totalweight(const Boat& b, const Car& c) {
    return b.getWeight() + c.getWeight();
}

int main() {
    double boatWeight, carWeight;

    // 从用户输入读取Boat和Car的重量
    cin >> boatWeight >> carWeight;

    // 创建Boat和Car对象
    Boat boat(boatWeight);
    Car car(carWeight);

    // 输出Boat和Car的重量
    cout << "boat's weight:" << boat.getWeight() << endl;
    cout << "car's weight:" << car.getWeight() << endl;

    // 计算并输出总重量
	cout.unsetf(ios::showpoint);
    cout << "total weight:" << totalweight(boat, car) << endl;

    // Boat和Car对象在main函数结束时自动析构
    return 0;
}