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C 
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C 