How do you invoke const integers in one function into another in C++ using pass by reference? - pass-by-reference

Question

#include <iostream>
using namespace std;
void asknumber(int,int,int,int,int,int,int);
void getClassnumbers();
int main() {
getClassnumbers();
asknumber();
system("pause");
return 0;
}
void asknumber(int &tests, int &projects, int &labs, int &attendance,
int &max_test, int &max_projects, int &max_labs, int &max_attendance) {
int min = 0;
getClassnumbers();
cout << "Enter a number between 0 and " << max_test << ":";
cin >> tests;
while (tests > max_test || tests < min) {
cout << "Invalid input. Enter a number between 0 and " << max_test <<
":";
cin >> tests;
}
cout << "Enter a number between 0 and " << max_projects << ":";
cin >> projects;
while (projects > max_projects || projects < min) {
cout << "Invalid input. Enter a number between 0 and " << max_projects
<< ":";
cin >> projects;
}
cout << "Enter a number between 0 and " << max_labs << ":";
cin >> labs;
while (labs > max_labs || labs < min) {
cout << "Invalid input. Enter a number between 0 and " << max_labs <<
":";
cin >> labs;
}
cout << "Enter a number between 0 and " << max_attendance << ":";
cin >> attendance;
while (attendance> max_attendance || attendance < min) {
cout << "Invalid input. Enter a number between 0 and " << max_attendance << ":";
cin >> attendance;
}
}
void getClassnumbers() {
int tests; int projects; int labs; int attendance;
const int max_test = 4; const int max_projects = 5; const int max_labs = 7; const int max_attendance = 50;
cout << "Enter number of tests: ";
cin >> tests;
cout << "Enter number of projects: ";
cin >> projects;
cout << "Enter number of labs: ";
cin >> labs;
cout << "Enter number of attendance days: ";
cin >> attendance;
}
I was wondering how to properly use pass by reference for me to use the cin values entered in the function getClassnumbers() to be used in the while loops in the function asknumber() in order to compare them with the maximum values declared in getClassnumbers()?