Virtual function problem

Hi!

I'm about to submit my program for my course, but there must be at least 2 virtual functions in it, and whenever there's a virtual function, I get a runtime error.

//Jatek.h

#ifndef JATEK_H
#define JATEK_H
#include <iostream>
using namespace std;

class Jatek {
 protected:
         char* leiras;
 public:
        Jatek();
//rest of the code
};

//Jatek.cpp

#include "Jatek.h"

Jatek::Jatek() {
    leiras = "nincs leiras";           
}
//rest of the code

//Tablajatek.h

#ifndef TABLAJATEK_H
#define TABLAJATEK_H
#include "Jatek.h"
#include <iostream>
using namespace std;

class Tablajatek: public Jatek {
   protected:
           int n;
           int** tabla;
   public:
           Tablajatek();
           virtual void a(); 
//rest of the code
};

//Tablajatek.cpp

#include "Tablajatek.h"

Tablajatek::Tablajatek(): Jatek() {                         
  n = 8;
  tabla = new int*[n];
  for (int i = 0; i<n; i++) {
     tabla[i] = new int[n];    
  }
  for (int i = 0; i<n; i++) {
    for (int j = 0; j<n; j++) {
      tabla[i][j] = 0;  
    }    
  }                         
}

void Tablajatek::a() {
     cout<<"hi";
     }
//rest of the code

//Reversi.h

#ifndef OSZTALY_H
#define OSZTALY_H
#include <iostream>
#include "Tablajatek.h"
using namespace std;

class Reversi: public Tablajatek {
   private:
     int szabad; //szabad mezők száma
     int kovetkezo;
   public:
          Reversi();
//rest of the code
};

//Reversi.cpp

#include "Reversi.h"

Reversi::Reversi() : Tablajatek() {
  kovetkezo = 1;
  szabad = 62; //8*8-4 = 62
  tabla[3][3] = 1;
  tabla[4][4] = 1;
  tabla[3][4] = 2;
  tabla[4][3] = 2;

//rest of the code      
}

//main.cpp

#include <fstream>
#include "Jatek.h"
#include "Tablajatek.h"
#include "Reversi.h"

int main() {
 Reversi Reverzi;
//rest of the code...
}

I tried putting in any kind of virtual function in any of the classes and it crashed at the "Reversi Reverzi;" part. Without a virtual function, it works fine.

PS: I tried putting it in without separating: like
virtual void a() {cout<<"hi";}
and it works, but we have to separate the code...
Any help is appreciated

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