Fatal error LNK1561 - entry point must be defined - c++

Question

So far I have created a simple linked list project that I will build on in the future. All files compile correctly but when I try to build my project it comes up with a link error. I used an empty project to start. The main.cpp is used to demo that my linked list actually works. I'm really stuck and don't know how to solve this issue.
Main.cpp
#include <stdio.h>
#include <iostream>
#include <cstdlib>
#include "LinkedList.cpp"
#include "LinkedList.h"
using namespace SDI;
template <class T>
int LinkedList<T>::main()
{
LinkedList<T> menu;
menu.insert(1);
menu.insert(4);
menu.insert(7);
menu.insert(2);
menu.insert(8);
menu.display();
Std::cout << "-----" << endl;
menu.remove(2);
menu.remove(1);
menu.remove(10);
menu.display();
return 0;
};
header file LinkedList.h
#ifndef SDI_LL
#define SDI_LL
namespace SDI
{
template < class T >
class LinkedList
{
class Node
{
int number;
Node* next;
};
private:
T head;
T current;
T temp;
public:
LinkedList();
~LinkedList();
int main();
void insert(int add);
void remove(int remove);
void display();
};
}
#endif
LinkedList.cpp
#include <stdio.h>
#include <iostream>
#include <cstdlib>
#include <string>
#include "LinkedList.h"
using namespace SDI;
template <class T>
LinkedList<T>::LinkedList()
{
head = NULL;
current = NULL;
temp = NULL;
};
template <class T>
void LinkedList<T>::insert(int add)
{
newnode = new Node;
newnode->next = NULL;
newnode->number = add;
if (head != NULL)
{
current = head;
while (current->next != NULL)
{
current = current->next;
}
current->next = newnode;
}
else
{
head = newnode;
}
};
template <class T>
void LinkedList<T>::remove(int remove)
{
remove1 = NULL;
temp = head;
current = head;
while (current != NULL && current->add != remove)
{
temp = current;
current = current->next;
}
if (current == NULL)
{
std::cout << "N/A\n";
delete remove1;
}
else
{
remove1 = current;
current = current->next;
temp->next = current;
if (remove1 == head)
{
head = head->next;
temp = NULL;
}
delete remove1;
}
};
template <class T>
void LinkedList<T>::display()
{
current = head;
while (current != NULL)
{
std::cout << current->number;
current = current->next;
}
};

Answer 1

You need a global main() function in your program, not the static version from LinkedList. The main function is called the entry point, and a quick lookup of the error message tells you this.
http://en.cppreference.com/w/cpp/language/main_function
Something along the lines of this might work:
int main()
{
LinkedList<int> menu;
menu.insert(1);
menu.insert(4);
menu.insert(7);
menu.insert(2);
menu.insert(8);
menu.display();
Std::cout << "-----" << endl;
menu.remove(2);
menu.remove(1);
menu.remove(10);
menu.display();
return 0;
};
Currently, you define a completely unrelated "main" function inside your class. This is just a plain normal function of your class and in no way related to the previously mentioned int main() entry point function.