Double declaration c++ - c++

Question

So I have some code in couple of files:
cells.cpp:
#include "cells.h"
#include <iostream>
using namespace std;
char convertIntChar (int symbolNumber)
{
char charR;
switch (symbolNumber)
{
case 0:
charR='0';
break;
// lust of case code here
case 63:
charR='\\';
break;
}
return charR;
}
class cell
{
public:
int iPosition;
char chPosition;
cell ()
{
static int i = -1;
i++;
chPosition=convertIntChar (i);
iPosition=i;
cout << " " << iPosition; //two lines of code to test
cout << " " << chPosition; //constructor
}
protected:
};
main.cpp
#include <iostream>
#include "cells.h"
#include "pointer.h"
using namespace std;
int main()
{
cout << "Hello world!" << endl;
createPointer();
cell cells[64];
return 0;
}
And comeplytly a cells.h
#ifndef CELLS_H_INCLUDED
#define CELLS_H_INCLUDED
#pragma once
class cell
char convertIntChar(int symbolNumber);
#endif // CELLS_H_INCLUDED
There I have an erros that sounds like
//filepath\|5|error: two or more data types in declaration of 'convertIntChar'|
||=== Build finished: 1 errors, 0 warnings (0 minutes, 7 seconds) ===|
What can it be. Sorry for noob question anyway.

Answer 1

First, this forward declaration needs a semi-colon:
class cell;
// ^
Second, you cannot use a forward declaration here. main.cpp needs to see the cell class definition. So you should put the definition in cells.h. For example:
cells.h:
#ifndef CELLS_H_INCLUDED
#define CELLS_H_INCLUDED
class cell
{
public:
int iPosition;
char chPosition;
cell ();
};
char convertIntChar(int symbolNumber);
#endif
cells.cpp:
#include "cells.h"
#include <iostream>
char convertIntChar (int symbolNumber)
{
char charR;
// as before
return charR;
}
cell::cell ()
{
static int i = -1;
i++;
chPosition=convertIntChar (i);
iPosition=i;
std::cout << " " << iPosition; //two lines of code to test
std::cout << " " << chPosition; //constructor
}

Answer 2

You have class cell in the cpp file which should go into the .h file.
Then in cells.h you are missing a ; after class cell.
Insterad of the forward declaration in cell.h, put the class there.