Adding Setters to a function template - c++

Question

I am trying to add setter to my project as a requirement but am stuck on making it work. I commented out the areas I have to add it but everything I have looked up has not worked. I know I am close but everything seems to not work.
#include "pch.h"
#include <string>
#include <conio.h>
#include <iostream>
using namespace std;
template <class T>
class Holder
{
private:
T thing;
int number; //add an integer data member that stores the number of data members of whatever class is stored in "thing"
public:
void standardInput();
void standardOutput();
void setNumber(int); // declare a setter function for the new data member
};
template <class T>
void Holder<T>::standardInput()
{
cout << endl;
cout << "You will be asked to enter " << n.setNumber << " items" << endl; // a line of output that use the data member with the number
cin >> Holder<T>::thing;
}
template <class T>
void Holder<T>::standardOutput()
{
cout << endl;
cout << "Here's the data you requested: " << endl;
cout << Holder<T>::thing << endl;
}
template<class T>
void Holder<T>::setNumber(int n) //implement the setter function for the new data member
{
setNumber = n;
}
// This is the first of two custom classes
class Student
{
friend ostream& operator<<(ostream&, Student&);
friend istream& operator>>(istream&, Student&);
private:
string name;
double tuiton;
};
ostream& operator<<(ostream& out, Student& a)
{
out << "The Student " << a.name << " Tuiton is: " << a.tuiton << endl;
return out;
}
istream& operator>>(istream& in, Student& a)
{
cout << "Enter the name of student: ";
in >> a.name;
cout << "What is the Price of tuiton? ";
in >> a.tuiton;
return in;
}
// This is the second of two custom classes
class FastFood
{
friend ostream& operator<<(ostream&, FastFood&);
friend istream& operator>>(istream&, FastFood&);
private:
int valueNumber;
double cost;
};
ostream& operator<<(ostream& out, FastFood& a)
{
out << " The Combo Number is " << a.valueNumber << " .It costs " << a.cost << endl;
return out;
}
istream& operator>>(istream& in, FastFood& a)
{
cout << "What is the Combo number? ";
in >> a.valueNumber;
cout << "Enter cost: ";
in >> a.cost;
return in;
}
int main()
{
cout << "For an integer: " << endl;
Holder<int> val;
// use the setter to store 1.
val.standardInput();
val.standardOutput();
cout << "For a Student:" << endl;
Holder<Student> aCollegeStudent;
// use the setter to store 2.
aCollegeStudent.standardInput();
aCollegeStudent.standardOutput();
Holder<FastFood> vMeal;
// use the setter to store 3.
vMeal.standardInput();
vMeal.standardOutput();
cout << endl;
system("pause");
return 0;
}
This is supposed to ask the integer along with the student and fastfood information. I required to add a setter in the template but wont need to use a getter due to standard input and output just cant figure out the right way to do it.