CTRL + Z使程序在C++中无限循环

Question

好的我在这里有问题.我正在制作一个幻灯片益智游戏.向玩家询问他想要移动哪一块直到拼图解决.如果玩家想要退出之前,键入Q或q按下enter将执行此操作.该程序工作得很好.但是我有一个问题:如果我插入CTRL+Z,该程序将loop意外...

这是重要的代码:

        // analyzes user input
        if (piece_to_move_string == "q" ||
            piece_to_move_string == "Q")
        {
            cout << endl << "You chose to quit." << endl;
            pressanykey();
            break;
        }
        else
        {
            piece_to_move = atoi(piece_to_move_string.c_str());

            if (1 <= piece_to_move && piece_to_move <= pow(puzzle_size,puzzle_size))
            {
                game_board = move_piece (game_board, piece_to_move);
            }
            else
            {
                cout << "Not possible.";
            }
        }

编辑:但仍然无法正常工作..

// analyzes user input
        if (piece_to_move_string == "q" ||
            piece_to_move_string == "Q")
        {
            cout << endl << "You chose to quit." << endl;
            pressanykey();
            break;
        }
        else if (cin.eof())
        {
            //do nothing
        }
        else
        {
            piece_to_move = atoi(piece_to_move_string.c_str());

            if (1 <= piece_to_move && piece_to_move <= pow(puzzle_size,puzzle_size))
            {
                game_board = move_piece (game_board, piece_to_move);
            }
            else
            {
                cout << "Not possible.";
            }
        }

Answer 1

Ctrl+Z意味着"文件结束"(假设你在Windows上),所以一旦用户点击它,你cin就处于不可读的状态.检查cin.eof():

if (cin.eof() || piece_to_move_string == "q" ||
                 piece_to_move_string == "Q")
{
    cout << endl << "You chose to quit." << endl;
}