【C/C++知识点】const与指针

int* q1 = &p1;
*q1 = 25;
q1 = &p2;
*q1 = 19;
cout << p1 << " " << p2 << endl;

const int* q2 = &p1;
cout << *q2 << endl;
q2 = &p2;
cout << *q2 << endl;

int* const q3 = &p1;
*q = 26;
cout << p1 << endl;

const int* const q4 = &p1;

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int p1 = 24;
    int p2 = 18;
    //第一种，正常指针
    //可以修改指向和值
    int* q1 = &p1;
    *q1 = 25;
    q1 = &p2;
    *q1 = 19;
    cout << p1 << " " << p2 << endl;
    //第二种，常量指针
    //可以修改指向，但是不能修改值
    const int* q2 = &p1;
    cout << *q2 << endl;
    q2 = &p2;
    cout << *q2 << endl;
    //第三种，指针常量
    //可以修改值，但是不可以修改指向
    int* const q3 = &p1;
    *q = 26;
    cout << p1 << endl;
    //第四种，指向常量的指针常量
    //指向和值都不能修改
    const int* const q4 = &p1;
    return 0;
}