Need help :X edit : What is this new error even :X

[jailabg]

#include <iostream>
using namespace std;
template <class T>
class stack;
template <class T>
class item
{
friend class stack<T>;
private:
item(T x = 0)
{
inf = x;
link = 0;
}
T inf;
item* link;
};
template <class T>
class stack
{
public:
stack(T x);
stack();
~stack();
stack(stack const &);

stack& operator= (stack const &);
void push(T const&);
int pop(T & x);
T top() const;
bool empty() const;
void print();
private:
item<T> *start;
void delstack();
void copy(stack const&);
};
template <class T>
stack<T>::stack(T x)
{
start = new item<T> (x);
}
template <class T>
stack<T>::stack()
{
start = NULL;
}
template <class T>
stack<T>::~stack()
{
delstack();
}
template <class T>
stack<T>::stack(stack<T> const & r)
{
copy(r);
}
template <class T>
stack<T>& stack<T>::operator=(stack<T> const& r);
{ if (this != &r) // The error is here and says "'{': missing function header (old-style formal list?)"
{
delstack();
copy(r);
}
return *this;
}
template <class T>
void stack<T>::delstack()
{
item<T> *p;
while (start)
{
p = start;
start = start->link;
delete p;
}
}
template <class T>
void stack<T>::copy(stack<T> const & r)
{
if (r.start)
{
item<T> *p = r.start,
*q = NULL,
*s = NULL;
start = new item<T>;
start->inf = p->inf;
start->link = q;
q = start;
p = p->link;
while (p)
{
s = new item<T>;
s->inf = p->inf;
q->link = s;
q = s;
p = p->link;
}
q->link = NULL;
}
else start = NULL;
}
template <class T>
void stack<T>::push(T const& x)
{
item<T> *p = new item<T>(x);
p->link = start;
start = p;
}
template <class T>
int stack<T>::pop(T & x)
{
item<T> *temp = start;
if (start)
{
x = start->inf;
start = start->link;
delete temp;
return 1;
}
else return 0;
}
template <class T>
T stack<T>::top() const
{
return (*start).inf;
}
template <class T>
void stack<T>::print()
{
T x;
while (pop(x))
cout << x << " ";
cout << endl;
}
template <class T>
bool stack<T>::empty() const
{
return start == NULL;
}

Please help me :X Im using Visual Studio

[jonnin]

stack<T>& stack<T>::operator=(stack<T> const& r); <-------- that ; looks like it shouldnt be there?

[jailabg]

Ohh yeah the ";" was not supposed to be there i think but now there are these 2 errors :X

LNK 2019 unresolved external symbol_main referenced in function int_cdecl invoke_main(void) (?invoke_main@@YAHXZ)
and
LNK1120 1 unresolved externals

Quick note : Sry for being such a cpp noob its just that im learning it in school and this is one of my assignments but i cant get this program to work :X