用C++编写程序:定义Student类和Score类，输出一个学生的成绩单（包括学号、姓名、高数、

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

class Student
{

public:
// 带参数的构造函数初始化对象
Student(int id, string name, double score)
: id(id), name(name), score(score)
{
count++;
total+=score;
}
// 修改分数成员函数
void ChangeScore(double newScore)
{
total +=newScore-score;

score=newScore;
}
static double GetAverage()
{
return total / count;
}
private:
int id;
string name;
double score;
private:
static double total;
static int count;
};

// 类外对静态数据成员进行定义声明
double Student::total = 0.0f;
int Student::count= 0;

void main()
{
// 声明四个学生对象并初始化
Student s1(1001,"James", 86);
Student s2(1001,"Kate", 67);
Student s3(1001,"Lucy", 91);
Student s4(1001,"LiLei", 65);

cout<<"The average score is "<<Student::GetAverage()<<endl;

// 修改成绩
s1.ChangeScore(50);
s2.ChangeScore(50);
s3.ChangeScore(50);
s4.ChangeScore(50);

cout<<"The average score is "<<Student::GetAverage()<<endl;

system("pause");
}

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