程序代码：

#include<iostream>
#include"student.h"
using namespace std;
CStudent::CStudent()
{
    strName="General Student";
    chinese=0;
    math=0;
    english=0;
}

CStudent::CStudent(std::string Name,double c,double m,double e)
{
    strName=Name;
    chinese=c;
    math=m;
    english=e;
}

CStudent CStudent::operator +(CStudent S)
{ 
    CStudent temp;
    temp.strName="Total Performance";
    temp.chinese=this->chinese+S.chinese;
    temp.math=this->math+S.english;
    temp.english=this->english+S.english;
    return temp;
}

ostream& operator <<(ostream& out,CStudent& S)
{
    out<<S.strName<<"("<<S.chinese<<" , "<<S.math<<" , "<<S.english<<")"<<endl;
    return out;
}

void CStudent::SetChinese(double a)
{
    chinese=a;
}

void CStudent::SetMath(double a)
{
    math=a;
}

void CStudent::SetEnglish(double a)
{
    english=a;
}

double CStudent::returnChinese()
{
    return chinese;
}

double CStudent::returnMath()
{
    return math;
}

double CStudent::returnEnglish()
{
    return english;
}

double CStudent::returnTotalPerformance()
{
    return chinese+math+english;
}

double CStudent::returnAverage()
{
    return (chinese+math+english)/3;
}

string CStudent::returnName()
{
    return strName;
}