重载流提取运算符的一般格式是

重载流提取运算符的一般格式是

A.ostream &operator>>(ostream & output，类名&对象名){...}

B.ostream &operator<<(ostream & output，类名&对象名){...}

C.istream &operator>>(istream & input，类名&对象名){...}

D.istream &operator<<(istream & input，类名&对象名){...}

正确答案是C