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---------- main.cpp ----------
#include <iostream>
#include "CStudent.h"

using namespace std;

int main()
{
	//Testfall 1
	CStudent student1("Muster", "Fritz", 123456);
	cout << student1 << endl;
	//Testfall 2
	CStudent student2("Muster", "Luise");
	cout << student2 << endl;
	//Testfall 3
	CStudent student3("Mayer", "Hans", 12);
	cout << student3 << endl;
	//Testfall 4
	CStudent student4;
	cout << student4 << endl;
	//Testfall 5
	CStudent student5(student1);	
	cout << student5 << endl;
	//Testfall 6
	student4.setName("Nachname", "Vorname");
	cout << student4 << endl;
	//Testfall 7
	student4.setNumMatr(234567);
	cout << student4 << endl;
	//Testfall 8
	student4.setNumMatr(12345678);
	cout << student4 << endl;
	return 0;
}


---------- CStudent.h ----------
#pragma once
#include <string>
#include <iostream>

class CStudent {
private:
	int m_numMatr;
	std::string m_firstname;
	std::string m_surname;  
public:
	CStudent(std::string surname = "NoName", std::string firstname = "NoName", int numMatr = -1);
	CStudent(CStudent& orig);
	void print();
	void setName(std::string firstname, std::string surname);
	bool setNumMatr(int matr);
	friend std::ostream& operator << (std::ostream& stream, CStudent& s);
};
std::ostream& operator << (std::ostream& stream, CStudent& s);



---------- CStudent.cpp ----------
#include <string>
#include "CStudent.h"
#include<iostream>
using namespace std;

CStudent::CStudent(string surname, string firstname, int numMatr)
{
	m_surname = surname;
	m_firstname = firstname;
    m_numMatr = -1;
	if(100000 <= numMatr && numMatr <= 999999)
		m_numMatr = numMatr;
}

CStudent::CStudent(CStudent& orig)
{
	m_surname = orig.m_surname;
	m_firstname = orig.m_firstname;
    m_numMatr = -1;
	if(100000 <= orig.m_numMatr && orig.m_numMatr <= 999999)
		m_numMatr = orig.m_numMatr;
}

void CStudent::setName( std::string firstname, std::string surname)
{
	m_firstname = firstname;
	m_surname = surname;
}

void CStudent::print()
{
	cout << "CStudent@" << this << ": " << m_surname << ", " << m_firstname << " " << "(" << m_numMatr << ")" << endl;
}

bool CStudent::setNumMatr(int matr)
{
	if(100000 <= matr && matr <= 999999)
		m_numMatr = matr;	
}

ostream& operator << (ostream& stream, CStudent& s)
{
	stream << "CStudent@" << &s << ": " << s.m_surname << ", " << s.m_firstname << " " << "(" << s.m_numMatr << ")";
	return stream;
}