5.6

#include <iostream>

using namespace std;

#include"time_user.h"

class student

{

public:

    void display();

public:

    int num;

    string name;

    char sex;

};

void student::display()

{

    cout << "num: " << num << endl;

    cout << "name: " << name << endl;

    cout << "sex: " << sex << endl;

}

int main()

{

    student stl1;

    stl1.name = "gyg";

    stl1.num = 1001;

    stl1.sex = 'm';

    stl1.display();

}