// const修饰的成员虚函数，能否在子类中重写？请举例说明
// 可以
#include <bits/stdc++.h>

using namespace std;

class A
{
public:
    virtual void show() const
    {
        cout << "A" << endl;
    }
};

class B : public A
{
public:
    virtual void show() const override
    {
        cout << "B" << endl;
    }
};

int main()
{
    A *p = new B;
    p->show(); // B

    B *q = new B;
    q->show(); // B
    return 0;
}