指针使用示例程序

 1 #include <iostream>
 2 using namespace std;
 3 class A
 4 {
 5 public:
 6     A();
 7     ~A();
 8     int get() const{ return *i; }
 9     void set(int x){ *i = x; }
10 private:
11     int *i;
12 };
13 int main()
14 {
15     A *p = new A;
16     cout << p->get() << endl;
17     p->set(0);
18     cout << p->get() << endl;
19     delete p;
20     return 0;
21 }
22 A::A()
23 {
24     cout << "构造函数执行中~~~~\n";
25     i = new int(999);
26 }
27 A::~A()
28 {
29     cout << "析构函数执行中~~~\n";
30     delete i;
31 }