點(diǎn)贊、投幣有什么用 ？讓我體驗(yàn)體驗(yàn) ！

#include<iostream>
using?namespace?std;

class?TwoCord?{
????private:
????????int?x,?y;
????public:
????????TwoCord(int?x,?int?yy)?{

????????????this->x?=?x;? ? ? //填空1
????????????y?=?yy;
????????}
????????void?display()?{
????????????cout?<<?"x="?<<?x?<<?",y="?<<?y;

????????}
};

class?ThreeCord:?public?TwoCord?{? ??//題目有誤!!?原題此僅為?class?ThreeCord

????????int?z;?//沒有訪問修飾,則默認(rèn)為?private

????public:
????????ThreeCord(int?x,?int?yy,?int?zz):?TwoCord(x,?yy)?{
????????????z?=?zz;
????????}
????????void?display()?{
????????????TwoCord::display();? ? ?//填空2
????????????
????????????cout?<<?",z="?<<?z;
????????}
};

int?main()?{
????ThreeCord?c(6,?8,?10);
????c.display();
????return?0;
}