#include<iostream>
#include<string>
#include<iomanip>
using namespace std;
class Student
{
public:
    Student(string n,int nu,int s)
    {
        name=n;
        number=nu;
        score=s;
    }
    string name;
    int number;
    int score;
    void out();
    friend void Max(Student *,Student *);
};

void Student::out()
{
    cout<<setw(8)<<name<<setw(8)<<number<<setw(8)<<score<<endl;
}

void Max(Student *p,Student *pm)
{
    for(int i=0;i<5;i++)
    {
        if((*(p+i)).score>(*pm).score)
        {
            *pm=*(p+i);
        }
    }
}


int main()
{
    Student Stud[5]={Student("LX",01,01),Student("LD",02,02),Student("GD",03,03),Student("PX",04,04),Student("SYL",05,05)};
    Student *p1=&Stud[0];
    Student *p2=&Stud[1];
    Student *p3=&Stud[2];
    Student *p4=&Stud[3];
    Student *p5=&Stud[4];
    cout<<setw(8)<<"name"<<setw(8)<<"number"<<setw(8)<<"score"<<endl;
    (*p1).out();
    (*p2).out();
    (*p3).out();
    (*p4).out();
    (*p5).out();
    Student *p=&Stud[0];
    Student *pm=("Max",0,0);
    Max(p,pm);
    (*pm).out();
    return 0;
}

编译没错误，运行报错，是为什么？

    Student *pm=("Max",0,0);
    Max(p,pm);
    (*pm).out();

改为

    Student pm("Max",0,0);
    Max(p,&pm);
    pm.out();