Thread: Help with: error LNK2019: unresolved external symbol

Hi,

I'm just learning about Struct and have written this very simple code:

Code:

#include <iostream>
#include <iomanip>
#include <vector>
#include <ios>
#include <string>
#include <algorithm>
#include "header.h"
#include <stdexcept>
#include <cctype>

using namespace std;

struct Date {

	int y, m, d;
	Date(int y, int m, int d);
	void add_day(int n);
};



int main()
{

	Date today(2010, 06, 16);

	cin.get();

	return 0;
}

But it won't compile and I get the following error:

test.obj : error LNK2019: unresolved external symbol "public: __thiscall Date:ate(int,int,int)" (??0Date@@QAE@HHH@Z) referenced in function _main

Any ideas please?

Thanks.