c++， 捞捞窝吧，啥都没学òᆺó

建立一个学生类，有学号，姓名，两门课的成绩，要求通过构建函数赋初值，输出一个学生的学号和平均成绩（类名后加123）

#include <iostream>
using namespace std;

class student123 {
private:
    string num;
    string name;
    double cir1;
    double cir2;
public:
    student123(string num, string name, double cir1, double cir2);
    ~student123();
    double average();
};

student123::student123(string num, string name, double cir1, double cir2) {
    this->num = num;
    this->name = name;
    this->cir1 = cir1;
    this->cir2 = cir2;
}

student123::~student123() {}

double student123::average() {
    return (cir1 + cir2) / 2.0;
}

int main() {
    student123 s("123", "zhoujiel", 80, 82);
    cout << s.average() << endl;
    return 0;
}