C++ 指针及二级指针使用实例说明

#include"iostream"
using namespace std;
void main()
{
    //指针就是两个用途提供目标的读取或改写， 那么二级指针就是为了提供对于内存地址的读取或改写

char ch1='b';
char ch2='e';
char *p1=&ch1;
char**p2=&p1;
*p1='m';
cout<<"p1:  "<<p1<<endl;
cout<<"*p1:  "<<*p1<<endl;
cout<<"&ch1:  "<<&ch1<<endl;
//cout<<"p1=&ch1";

cout<<"p2:  "<<p2<<endl;
cout<<"*p2:  "<<*p2<<endl;
cout<<"**p2:  "<<**p2<<endl;
//cout<<"*p2=p1  **p2=*p1"
//cout<<"（二级指针）p2即p1的地址";

*p2=&ch2;  //*p2即p1 所以p1=&ch2
cout<<"p1: "<<p1<<endl;
cout<<"*p1: "<<*p1<<endl;
cout<<"*p2:  "<<*p2<<endl;
cout<<"**p2:  "<<**p2<<endl;
cout<<"p2: "<<p2<<endl;
*p1='n';
cout<<"*p1:  "<<*p1<<endl;
cout<<"*p2:  "<<*p2<<endl;
cout<<"**p2:  "<<**p2<<endl;
system("pause");

}