/*编写一个程序：输入几个学生的姓名、英语和计算机成绩，
然后按照总分从高到低排序。要求定义一个student类，用友元函数实现排序。*/
#include <iostream>
using namespace std;
#include<string>
class student
{
public:

    void set()
    {
        cout<<"请输入学生学生姓名，英语成绩，计算机成绩"<<'\n';
        cin>>name>>score1>>score2;
        sum=score1+score2;
    }
    void show()
    {
        cout<<"姓名："<<name<<'\t'<<"英语成绩:"<<score1<<'\t'<<"计算机成绩:"<<score2<<'\n';}

friend void panxu(student op[],int n)
    {
    float temp;
    for(int i=0;i<n-1;i++)
    for(int j=1;j<n;j++)
    {
        if(op[i].sum<op[j].sum)
        {
            temp=op[j].sum;
            op[i].sum=op[j].sum;
            op[j].sum=temp;
            op[i].name=op[j].name;
            op[i].score1=op[j].score1;
            op[i].score2=op[j].score2;
        }

   
    }
    }
private:
    string name;
    float score1;
    float score2;
    float sum;
};

   
int main()
{
    int n;
    student op[50];
    cout<<"请输入学生人数：";
    cin>>n;
    for(int t=0;t<n;t++)
    {
        op[t].set;
    }
   
    cout<<"排序后....."<<'\n';
    panxu(op,n);
    for(int k=0;k<n;k++)
    {
        op[k].show();}   
      return 0;
}

报错：error C3867: 'student::set': function call missing argument list; use '&student::set' to create a pointer to member
其它的，也一塌糊涂，算法也错误。更重要的是，这不是C++的写法。

#include <iostream>
#include <string>

struct student
{
    std::string name;
    float eng_score;
    float cpt_score;

    student() : name(), eng_score(), cpt_score()
    {
    }
    float sum() const
    {
        return eng_score+cpt_score;
    }
};
std::istream& operator>>( std::istream& in, student& stu )
{
    return in >> stu.name >> stu.eng_score >> stu.cpt_score;
}
std::ostream& operator<<( std::ostream& out, const student& stu )
{
    return out<<"name:"<<stu.name<<"\tenglish score:"<<stu.eng_score<<"\tcomputer score:"<<stu.cpt_score;
}

#include <vector>
#include <algorithm>
using namespace std;

int main( void )
{
    size_t n;
    cout << "请输入学生人数：";
    cin >> n;

    std::vector<student> stus( n );
    cout << "请输入学生学生姓名，英语成绩，计算机成绩\n";
    for( size_t i=0; i!=stus.size(); ++i )
        cin >> stus[i];

    std::sort( stus.begin(), stus.end(), [](const student& a,const student& b){return a.sum()>b.sum();} );

    for( size_t i=0; i!=stus.size(); ++i )
        cout << stus[i] << '\n';
}

输入
3
a 1 1
b 3 3
c 2 2
输出
name:b  english score:3 computer score:3
name:c  english score:2 computer score:2
name:a  english score:1 computer score:1

你的程序太高级别了，小白表示看不懂，