持续创作，加速成长！这是我参与「掘金日新计划 · 6 月更文挑战」的第4天，点击查看活动详情。
题目描述
1、建立如下的类继承结构：
1)一个球员类Player作为基类，具有name、height、weight等数据成员，display()等成员函数
2)从Player类派生出最有价值球员类MVP，添加属性：获奖年year
3)从Player类派生出最佳防守球员类DPOY，添加属性：获奖年year
4)从MVP和DPOY派生出名人堂类HallOfFame
2、分别定义以上类的构造函数、输出函数display及其他函数（如需要）。
3、在主函数中定义各种类的对象，并测试之，通过对象调用display函数产生输出。
输入
第一行输入球员的名字，身高，体重
第二行输入MVP获奖年
第三行输入DPOY获奖年
输出
构造四个类对象，并按照如下格式进行输出。
输入样例1
Michael 198 96
2010
2011
输出样例1
Player:
name:Michael
height:198
weight:96
MVP:
name:Michael
height:198
weight:96
reward:win the MVP reward in 2010
DPOY:
name:Michael
height:198
weight:96
reward:win the DPOY reward in 2011
Hall of fame:
name:Michael
height:198
weight:96
reward1:win the MVP reward in 2010
reward2:win the DPOY reward in 2011
思路分析
这道题涉及到类的多重继承，Player作为基类派生出MVP和DPOY，然后由这两个子类共同派生出HallOfFame类。
问题是MVP和DPOY都分别继承了Player的属性，而HallOfFame同时把它们相同的属性都继承了，这就导致了HallOfFame在访问Player的属性时会不知道是去找MVP的还是去找DPOY的。
因此，需要在父类继承的时候加上virtual修饰，这样多重继承的时候就只会继承一个相同的属性。
还有一个问题就是在多重继承的类的构造函数带参数的时候，需要把所有父辈的构造函数的参数带上，包括祖辈的。
AC代码
#include<iostream>
#include<string>
using namespace std;
class Player
{
protected:
string name;
int height,weight;
public:
Player(string name,int height,int weight):name(name),height(height),weight(weight){}
void display(){cout<<"Player:"<<endl<<"name:"<<name<<endl<<"height:"<<height<<endl<<"weight:"<<weight<<endl<<endl;}
};
class MVP:virtual public Player
{
protected:
string year;
public:
MVP(string year,string name,int height,int weight):year(year),Player(name,height,weight){}
void display(){cout<<"MVP:"<<endl<<"name:"<<name<<endl<<"height:"<<height<<endl<<"weight:"<<weight<<endl<<"reward:win the MVP reward in "<<year<<endl<<endl;}
};
class DPOY:virtual public Player
{
protected:
string year;
public:
DPOY(string year,string name,int height,int weight):year(year),Player(name,height,weight){}
void display(){cout<<"DPOY:"<<endl<<"name:"<<name<<endl<<"height:"<<height<<endl<<"weight:"<<weight<<endl<<"reward:win the DPOY reward in "<<year<<endl<<endl;}
};
class HallOfFame:public MVP,public DPOY
{
public:
HallOfFame(string year1,string year2,string name,int height,int weight):Player(name,height,weight),MVP(year1,name,height,weight),DPOY(year2,name,height,weight){}
void display(){cout<<"Hall of fame:"<<endl<<"name:"<<name<<endl<<"height:"<<height<<endl<<"weight:"<<weight<<endl<<"reward1:win the MVP reward in "<<MVP::year<<endl<<"reward2:win the DPOY reward in "<<DPOY::year<<endl<<endl;}
};
int main()
{
string year1,year2,name;
int height,weight;
cin>>name>>height>>weight>>year1>>year2;
Player player(name,height,weight);
player.display();
MVP mvp(year1,name,height,weight);
mvp.display();
DPOY dpoy(year2,name,height,weight);
dpoy.display();
HallOfFame halloffame(year1,year2,name,height,weight);
halloffame.display();
}
