定义一个描述学生基本情况的类，数据成员包括姓名、学号、C++、英语和数学成绩，成员函数包括输出数据，姓名和学号、三门课的成绩，求出总成绩和平均成绩。

#include <iostream>
using namespace std;

class Student {
private:
    string name;
    string id;
    int score_c;
    int score_e;
    int score_m;
public:
    void setName(string name);
    void setId(string id);
    void setScore(int c, int e, int m);
    void displayBasicInfo();
    void displayScores();
    void displayTotalAndAverage();
};

void Student::setName(string name) {
    this->name = name;
}

void Student::setId(string id) {
    this->id = id;
}

void Student::setScore(int c, int e, int m) {
    score_c = c;
    score_e = e;
    score_m = m;
}

void Student::displayBasicInfo() {
    cout << "姓名：" << name << endl;
    cout << "学号：" << id << endl;
}

void Student::displayScores() {
    cout << "C语言成绩：" << score_c << endl;
    cout << "英语成绩：" << score_e << endl;
    cout << "数学成绩：" << score_m << endl;
}

void Student::displayTotalAndAverage() {
    int total = score_c + score_e + score_m;
    double average = total / 3.0;
    cout << "总成绩：" << total << endl;
    cout << "平均成绩：" << average << endl;
}

int main() {
    Student stu;
    stu.setName("张三");
    stu.setId("20210001");
    stu.setScore(90, 80, 85);
    stu.displayBasicInfo();
    stu.displayScores();
    stu.displayTotalAndAverage();
    return 0;
}