用c++该怎样正确编译student下的这no，name，gender，email，phone，address，clazz几个函数

student｛
no: '2021{{integer(100,999)}}',
name: '{{random("张三", "李四", "王五")}}',
age: '{{integer(18, 22)}}',
gender: '{{gender()}}',
email: '{{email()}}',
phone: '{{phone()}}',
address: '{{city()}}',
clazz: '2021级{{integer(10,10)}}班',｝

#include<iostream>
#include<string>
#include<algorithm>
#include<time.h>
using namespace std;
class student
{
public:
    int no()
    {
        return 2021 * 1000 + rand() % 900 + 100;
    }
    int age()
    {
        return rand() % 5 + 18;
    }
    string name()
    {
        string s[3] = { "张三","李四","王五" };
        return s[rand() % 3];
    }
    string gender()
    {
        string s[2] = {"男","女"};
        return s[rand() % 2];
    }
    string email()
    {
        char e[20];
        for (int i = 0; i < 20; i++)
        {
            e[i] = rand() % 30 + 97;
        }
        e[19] = '\0';
        e[10] = '@';
        return e;
    }
    long long phone()
    {
        return rand() % 90000000000 + 10000000000;
    }
    string address()
    {

    }
    string clazz()
    {
        string s1 = "2021级", s2 = "班";
        s1.push_back(rand() % 10 + 1 + '0');
        return s1 + s2;
    }
};
int main()
{
    srand((unsigned int)time(NULL));
    student s;
    cout << s.age() << endl << s.clazz() << endl << s.email() << endl 
        <<s.name()<<endl<< s.gender() << endl << s.no()<< endl << s.phone() << endl;
}