用c++输出1321 samsung message send定义Telephone和其公用派生类Mobile并用friend int operatoe<(Mobile &x1,Mobile &x2且主函数为void main() { Mobile m1; Mobile m2("samsung",3500,1321); if(m1<m2) m1.message(); else m2.message(); } )

根据你的要求，可以这样实现：

#include <iostream>
#include <string>
using namespace std;

class Telephone {
protected:
    int number;
public:
    Telephone() {
        number = 1234;
    }
    Telephone(int n) {
        number = n;
    }
    void showNumber() {
        cout << "my phone number is: " << number << endl;
    }
    void call() {
        cout << "the phone is calling..." << endl;
    }
};

class Mobile : public Telephone {
private:
    string brand;
    int price;
public:
    Mobile() {
        number = 1321;
        brand = "samsung";
        price = 0;
    }
    Mobile(string b, int p, int n) {
        brand = b;
        price = p;
        number = n;
    }
    void message() {
        cout << "Send message from " << brand << " mobile, price is " << price << ", number is " << number << endl;
    }
    friend int operator<(Mobile& x1, Mobile& x2);
};

int operator<(Mobile& x1, Mobile& x2) {
    return x1.number < x2.number;
}

int main() {
    Mobile m1;
    Mobile m2("samsung", 3500, 1321);
    if (m1 < m2)
        m1.message();
    else
        m2.message();
    return 0;
}

输出结果为：

Send message from samsung mobile, price is 3500, number is 1321

其中，Mobile类继承自Telephone类，并添加了brand和price成员变量。在主函数中，我们定义了两个Mobile对象m1和m2，并比较它们的number大小。根据比较结果，我们调用对应Mobile对象的message函数，输出相应的消息。