用c++生成按下列要求编写程序。 （1）定义一个分数类Score。它有 3个数据成员： Chinese //语文课成绩 English //英语课成绩 Mathematics //数学课成绩 2个构造函数：无参的和带参数的 3个成员函数：是否带参数根据需要自定 sum() //计算三门课总成绩 print() //输出三门课成绩和总成绩 modify() //修改三门课成绩 （2）定义一个学生类Student。它有 3个数据成员： Num //学号 Name //姓名 MyScore //成绩 2个构造函数：无参的和带参数的 3个成员函数：是否带参数根据需要自定 sum() //计算某学生三门课总成绩 print() //输出某学生学号、姓名和成绩 modify() //修改某学生学号、姓名和成绩 在主函数中，先定义一个学生类对象数组，再通过for循环给对象数组赋上实际值，最后输出对象数组个元素的值

好的，您要求的C++代码如下：

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

class Score {
private:
  int Chinese, English, Mathematics;
public:
  Score() {}
  Score(int Chinese, int English, int Mathematics) {
    this->Chinese = Chinese;
    this->English = English;
    this->Mathematics = Mathematics;
  }
  int sum() {
    return Chinese + English + Mathematics;
  }
  void print() {
    cout << "语文：" << Chinese << "，英语：" << English << "，数学：" << Mathematics << "，总成绩：" << sum() << endl;
  }
  void modify(int Chinese, int English, int Mathematics) {
    this->Chinese = Chinese;
    this->English = English;
    this->Mathematics = Mathematics;
  }
};

class Student {
private:
  int Num;
  string Name;
  Score MyScore;
public:
  Student() {}
  Student(int Num, string Name, Score MyScore) {
    this->Num = Num;
    this->Name = Name;
    this->MyScore = MyScore;
  }
  int sum() {
    return MyScore.sum();
  }
  void print() {
    cout << "学号：" << Num << "，姓名：" << Name;
    cout << "，成绩为：" ;
    MyScore.print();
  }
  void modify(int Num, string Name, int Chinese, int English, int Mathematics) {
    this->Num = Num;
    this->Name = Name;
    MyScore.modify(Chinese, English, Mathematics);
  }
};

int main() {
  Student students[3];
  for (int i = 0; i < 3; i++) {
    int num, chinese, english, math;
    string name;
    cout << "请输入第" << i+1 << "个学生的学号、姓名、成绩（语文、英语、数学）：";
    cin >> num >> name >> chinese >> english >> math;
    Score score(chinese, english, math);
    Student student(num, name, score);
    students[i] = student;
  }

  for (int i = 0; i < 3; i++) {
    students[i].print();
  }

  return 0;
}