继承、虚函数、运行时多态 与 静态多态截图

#include <string>
#include <iostream>

class A{
public: 
    virtual std::string toString(){
    //std::string toString(){
        return "A";
    }
};

class B: public A{
public: 
    //override 防止覆写函数名错误
    std::string toString() override {
    //std::string toString(){
        return "B";
    }
};

class C: public B
{
public: 
    std::string toString(){
        return "C";
    }
};
//对象指针
void print(A* o){
    std::cout<<o->toString()<<std::endl;
}
//对象引用
void print(A& o){
    std::cout<<o.toString()<<std::endl;
}

//虚函数、 基类对象指针、引用
int main() {
    A a;
    B b;
    C c;
    
    print(&a);
    print(&b);
    print(&c);
    
    print(a);
    print(b);
    print(c);
    return 0;
}