Header file trong C++

//Student.h

#pragma once
 #include "Point.h"
 #include<string>
using namespace std;
class Student
{

	private:

		string id;
		string name;
		string address;
		string sex;
		Point point;
	public:

		Student();
		~Student();

		void setId(string);
		string getId();

		void setName(string);
		string getName();
	
		void setAddress(string);
		string getAddress();
	
		void setSex(string);
		string getSex();

		void setPoint(Point);
		Point getPoint();
	
};

 //Student.cpp
 #include "Student.h"


Student::Student(){
}

void Student::setId(string ID) {

	 id = ID;
}

string Student::getId() {
         return id;
}

void Student::setName(string NAME) {
	name = NAME;
}
string Student::getName() {
	return name;
}

void Student::setAddress(string ADDRESS) {
	address = ADDRESS;
}
string Student::getAddress() {
	return address;
}

void Student::setSex(string SEX){
	sex = SEX;
}
string Student::getSex() {
	return sex;
}

 void Student::setPoint(Point POINT) {
	point = POINT;
}

 Point Student::getPoint() {
	return point;
}

//Point.h
 #pragma once
class Point
{
	private:

		string id;
		float math;
		float physical;
		float chemistry;
		float sum;
	
	public:
		Point();
		~Point();

		void setId(string);
		string getId();
		
		void setMath(float);
		float getMath();

		void setPhysical(float);
		float getPhysical();
	
		void setChemistry(float);
		float getChemistry();
};

//Point.cpp
 #include "Point.h"
 #include<string>
 using namespace std;

Point::Point(){
	
}
void Point::setId(string ID) {
	id = ID;
}
string Point::getId(){
	return id;
}
void Point::setMath(float MATH) {
	math = MATH;
}
float Point::getMath() {
	return math;
}
void Point::setPhysical(float PHYSICAL) {
	physical = PHYSICAL;
}
float Point::getPhysical() {
	return physical;
}
void Point::setChemistry(float CHEMISTRY) {
	chemistry = CHEMISTRY;
}
float Point::getChemistry() {
	return chemistry;
}

//Student_Controller.h
 #pragma once
 #include"Student.h"
 #include"Point.h"
class Student_controller
{

	public:
		Student_controller();
		~Student_controller();

		void show_student();
		void add_student(Student);
		bool modify_student(string);
		bool delete_student(string);
		void sort_student(Student);
		void search_student();

};

//Student_Controller.cpp
 #include "Student_controller.h"
 #include "Student.h"
 #include "Point.h"
 #include "iostream"

using namespace std;


Student_controller::Student_controller()
{
}
void Student_controller::add_student(Student st) {
	
}

Bây giờ em muốn viết hàm add_student() nhưng em không biết gọi thằng Student kiểu gì. mọi người có thế cho em xin demo hàm này được không ạ!