game.cpp
#include <iostream>
#include <string>
#include <sstream>
#include "game.h"
#include "board.h"
#include "piece.h"
using namespace std;
game.h
#ifndef GAME_H
#define GAME_H
#include <string>
class Game
{
    private:
        string white;
        string black;
        string title;
    public:
        Game(istream&, ostream&);
        void display(colour, short);
};
#endif
Ошибка:
game.h:8 error: 'string' does not name a typegame.h:9 error: 'string' does not name a type