你可以通过修改地址间接修改指针指向的值
#include<iostream>
using namespace std;
int main()
{
int a = 10;
int b = 20;
const int * pLen = &b;
int * const pNum = &a;
//pNum = &b;
pLen =&a;
cout << *pLen << endl;
*pNum = 22;
cout << *pNum << endl;
system("pause");
}
