#include <iostream>
using namespace std;
int main()
{
int a = 3;
int* p = &a;//一级指针，定义了一个指针指向这个变量
int** z=&p; //定义了一个二级指针指向p指针
cout <<"a = " << a <<endl;
cout <<"*&a = " << (*&a) <<endl; // *&放在一起相当于没有或抵消
cout << "*p = "<<(*p)<<endl;
cout<<"-------------------------------"<< endl;
cout << "p = "<< p <<endl;//p指向a的地址，即p == &a，所以*p == *&a == a
cout << "&a =" << (&a) <<endl;//a的地址
cout << "&p = " <<(&p) <<endl;//p的地址
cout <<"z = " <<z <<endl;
cout << "*z = " << (*z) <<endl;
cout << "**z =" <<(**z) <<endl;
return 0;
}
