friend istream&operator>>(istream &in,Point &p) ;friend istream&operator >>(istream &in,Point &p) ; 这里的&符号又是什么意思啊

friend istream &operator>> 还有请问friend istream& operator >>(istream &,zhui &); 里istream是什么 friend istream&operator>>(istream &in,Point &p) ;friend istream&operator >>(istream &in,Point &p) ; 这里的&符号又是什么意思啊 Opera. My parents’ friend ________ Beijing Opera very much. istream& operator >>(istream &,C &);这句怎样理解?我知道重载的是operator后面的>> 就是重载的cin>>但是istream 另外我发现istream只能写成这样.不能写成其他.如ist很奇怪.这个istream又是什么意思? 这个没有实现(istream &in,CCounter &obj);的作用! Beijing Opera OPERA怎么样? OPERA怎么样? Soap opera opera是什么意思 OPERA是什么意思? Syden Opera 翻译①give a puppet show②Beijing opera shows③have problem with④your pen friend ⑤a nice present see often with beijing friend opera goes her to alicia 组成一句want about do know to my sport you favorite组成一句 i often watch it on【 w .】with my chinese friend【it】指—beijing opera 的确the 没有，句子就这么长。囧 Beijing Opera is also called ( ) Opera.