friend ostream & operator

friend ostream & operator VC++6.0中,符号&的功能“引用”有什么作用呢?比如int x=1；int &y=x；有什么作用呢?那么这句话中的&是什么意思呢?friend ostream &operator Eur Ope Et En France //改成this -> fun()怎么不行呢?ostream& operator C++:abnormal program termination //我的编译器是VC6.0#include#include#include//using namespace std;class Date{int year,month,day;void init();public:Date(const std::string& s);Date(int y=2000,int m=1,int d=1);void display(); friend ostream& opera 英语翻译The other day as I talked with a friend I recalled a story that I heard this summer.A compassionate person,seeing a butterfly struggling to free itself from its cocoon,and wanting to help,very gently loosened the filaments to form an ope friend CбOPE ПOKOф OПЩйй KOHTAKTы bosom friend是哪种friend? friend code close friend close friend Girl friend Friend And friend是什么意思? Gay Friend friend是什么意思? friend是什么意思