84.friend友元类

 #include <iostream>
 using namespace std;

 //友元函数的主要作用就是访问私有变量
 class myclass
 {
 public:
     friend class newclass;
 private:
     int x;
     int y;
     int z;

 };

 class newclass
 {
 private:
     myclass my;
     char *password = "calc";

 public:
     void outit()
     {
         cout << password << my.x << my.y << my.z;
     }
 };

 void main()
 {

     cin.get();
 }