本程序定义一个类 Student，使用非静态成员函数、静态成员函数和静态数据成员计算学生某门课程的总成绩，并在主函数中进行测试，请按照横线后的说明补全程序。 #include<iostream> using namespace std; class Student{ private: float score; //声明float类型静态数据成员total_score public: void account(float score1) {score=score1;total_score=total_score+score;} {return total_score;}}; //定义float类型静态数据成员函数sum() //初始化静态数据成员total_score，将初值设置为0 int main() {Student s1[3]; s1[0].account(90); cout<< <<endl;//通过类名引用静态数据成员函数sum() s1[1].account(70); cout<<s1[1].sum()<<endl; s1[2].account(80); cout<<s1[2].sum()<<endl;}

#include <iostream>

using namespace std;

class Student
{
public:
  // 非静态成员函数：计算某门课程的总成绩
  int CalculateTotalScore(int score1, int score2, int score3)
  {
    return score1 + score2 + score3;
  }

  // 静态成员函数：计算所有学生某门课程的平均分
  static float CalculateAverageScore(int total_score, int student_num)
  {
    return (float)total_score / student_num;
  }

  // 静态数据成员：存储学生数量
  static int student_num;
};

// 在类外定义和初始化静态数据成员
int Student::student_num = 0;

int main()
{
  Student::student_num = 3;  // 设置学生数量

  Student student1, student2, student3;

  // 计算学生1的总成绩
  int total_score1 = student1.CalculateTotalScore(80, 90, 85);
  cout << "Total score of student1: " << total_score1 << endl;

  // 计算学生2的总成绩
  int total_score2 = student2.CalculateTotalScore(75, 85, 82);
  cout << "Total score of student2: " << total_score2 << endl;

  // 计算学生3的总成绩
  int total_score3 = student3.CalculateTotalScore(70, 80, 75);
  cout << "Total score of student3: " << total_score3 << endl;

  // 计算所有学生某门课程的平均分
  int total_score = total_score1 + total_score2 + total_score3;
  float average_score = Student::CalculateAverageScore(total_score, Student::student_num);
  cout << "Average score of all students: " << average_score << endl;

  return 0;
}