c++ - declaration is incompatible with (method) - pointers - c++

Question

I recently started playing around with c++, but for I don't understand what this means:
I get this error:
declaration is incompatible with "void
student_system::addStudent(<error-type> z)" (declared at line 31)
and the same goes for removeStudent and editStudent
I copied over the "function()" from another stackoverflow post, which seems fine and added the header with no issues, but my own "student" methods don't seem to work, I do not understand why,
I also tried adding the pointers rather than the variable but that didn't work either ( and by pointer I mean " student *x ").
#include "database.h"
#include <vector>
int main()
{
return 0;
}
class student_system
{
private:
list<student> studList;
public:
student_system();
void addStudent(student x);
void removeStudent(student y);
void editStudent(student z);
void findPos();
void function(int a, int b, vector<int> *p);
};
student_system::student_system()
{
//constructor
}
void student_system::addStudent(student x) // <------------- LINE 31
{
studList.push_back(x);
}
void student_system::removeStudent(student y)
{
/*studList.rem*/
}
void student_system::editStudent(student z)
{
/*get{ return value; }
set{ }*/
}
void student_system::findPos()
{
}
void student_system::function(int a, int b, vector<int> *p)
{
}
class student
{
private:
string name, surname, ID;
int sid;
public :
student::student(int sid, string n, string s, string id);
};
student::student(int sid, string n, string s, string id)
{
(*this).sid = sid;
(*this).name = n;
(*this).surname = s;
(*this).ID = id;
}

Answer 1

Put this bit of code
class student
{
private:
string name, surname, ID;
int sid;
public :
student::student(int sid, string n, string s, string id);
};
Just after the
#include <vector>
So that student_system and its definitions know about it

Answer 2

Add class student; above your student_system class definition.
Edit
Using forward declarations we can only declare methods in which we can use incomplete type not define. So, my first answer was wrong, but the following code will work.
int main()
{
return 0;
}
// Forward Declaration
class student;
// ================================
// Class student_system
// ================================
class student_system
{
private:
list<student> studList;
public:
student_system();
void addStudent(student x);
void removeStudent(student y);
void editStudent(student z);
void findPos();
void function(int a, int b, vector<int> *p);
};
// ================================
// Class student
// ================================
class student
{
private:
string name, surname, ID;
int sid;
public :
student(int sid, string n, string s, string id);
};
// ================================
// Definition of methods
// ================================
student::student(int sid, string n, string s, string id)
{
(*this).sid = sid;
(*this).name = n;
(*this).surname = s;
(*this).ID = id;
}
student_system::student_system()
{
//constructor
}
void student_system::addStudent(student x)
{
studList.push_back(x);
}
void student_system::removeStudent(student y)
{
/*studList.rem*/
}
void student_system::editStudent(student z)
{
/*get{ return value; }
set{ }*/
}
void student_system::findPos()
{
}
void student_system::function(int a, int b, vector<int> *p)
{
}

Answer 3

1) Please simplify a problem down to its basest elements before posting.
2) Please don't post code that relies on non-provided includes or implicit "using" statements or the like
3) "student" should be declared before student_system. The fact that you're not getting more errors surprises me, but maybe you're doing something unseen in database.h