C++面向对象程序设计 016:惊呆！Point竟然能这样输入输出 ---- (北大Mooc)

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原题题目

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代码实现

friend istream & operator>>(istream & is,Point & a)
    {
    
    
        is>>a.x>>a.y;
        return is;
    }
    friend ostream & operator <<(ostream & os,const Point &a)
    {
    
    
        os<<a.x<<','<<a.y;
        return os;
    }