对cin有麻烦

Question

cout << "It is your turn " << name << endl;
cout << "Please type the piece you want to move in this form: x,y" << endl;
int xSrc, ySrc;
char buffer[4];
buffer[3] = '\0';

//Check input
try {
    cin >> buffer;
    cin.get(buffer, 4);
    cout << std::cin.gcount() << " characters read: " << buffer << '\n';
    xSrc = buffer[0];
    ySrc = buffer[2];
    cout << "What u wrote:" << xSrc << " " << ySrc << endl;

    if (cin.fail()) {
        cin.clear();
        throw "Your input isn't formatted correctly:";
    }
}

我正在创造一个国际象棋游戏。玩家通过以下方式输入他们想要移动棋子的坐标：2,2

由于某种原因，我的缓冲区没有获得第一个2.缓冲区只包含，2

为什么会这样？