类指针引用

 1 #include <iostream>
 2 
 3 class myclass
 4 {
 5 public:
 6     int x;
 7     int y;
 8 public:
 9     myclass(int, int);//构造函数
10     void printxy();
11 };
12 
13 myclass::myclass(int a, int b) :x(a), y(b)//构造函数
14 {
15 
16 }
17 
18 void myclass::printxy()
19 {
20     std::cout << x << " " << y << std::endl;
21 }
22 
23 void main()
24 {
25     myclass *p(new myclass(10, 9));//一级指针
26     
27     p->printxy();
28 
29     myclass class1(20, 1);
30 
31     myclass **pp = &p;//二级指针
32 
33     (*pp)->printxy();//一级指针
34     (**pp).printxy();//0级指针
35     
36     system("pause");
37 }