指针使用示例程序

程序示例

#include <iostream>
using namespace std;
class A
{
public:
    A();
    ~A();
    int get() const{ return *i; }
    void set(int x){ *i = x; }
private:
    int *i;
};
int main()
{
    A *p = new A;
    cout << p->get() << endl;
    p->set(0);
    cout << p->get() << endl;
    delete p;
    return 0;
}
A::A()
{
    cout << "构造函数执行中~~~~
";
    i = new int(999);
}
A::~A()
{
    cout << "析构函数执行中~~~
";
    delete i;
}

结果：