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  • C++练习--创建Boat类和Car类(含友元)

    /*
    定义Boat与Car两个类,二者都有weight属性,
    定义二者的一个友元函数totalWeight()为外部函数,
    计算二者的重量和。
    */
    #include<iostream>
    #include<string>
    using namespace std;
    class Boat;
    class Car {
    private:
        double weight;
    public:
        Car(double wg) {
            this->weight = wg;
        }
        Car(Car &tp) {
            this->weight = tp.weight;
        }
        double getWeight() {
            return weight;
        }
        ~Car() {
    
        }
        void show() {
            cout << "This is a Car:" << endl;
            cout << "Weight:" << weight << endl;
        }
    };
    class Boat {
    private:
        double  weight;
    public:
        Boat(double wg) {
            this->weight = wg;
        }
        Boat(Boat &tp) {
            this->weight = tp.weight;
        }
        double getWeight() {
            return weight;
        }
        ~Boat()
        {
    
        }
        friend double totalWeight(Boat &a, Car &b);
        void show() {
            cout << "This is a Boat:" << endl;
            cout << "Weight:" << weight << endl;
        }
    };
    double totalWeight(Boat &a, Car &b) {
        return a.getWeight() + b.getWeight();
    }
    int main() {
        Boat a(1024.0);
        Car b(1024.0);
        a.show();
        b.show();
        cout << "The total weight of the Car and the Boat:" << endl;
        cout << totalWeight(a, b);
        return 0;
    }
    • 测试截图
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  • 原文地址:https://www.cnblogs.com/FlyerBird/p/8995963.html
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