这个人员类有什么问题，该怎么解决
#include<iostream>
using namespace std;
class Birthday
{
private:
        int Year;
        int Month;
        int Day;

public:
        Birthday(){};
        Birthday(int y,int m,int d)
  {Year=y;Month=m;Day=d;}
  void Set(int y,int m,int d){Year=y;Month=m;Day=d;}
  void Show(){Cout<<Year<<"-"<<Month<<"-"<<"Day;
  };
 
Birthday::Birthday(Birthday &b)
 {Year=b.Year;
Month=b.Month;
Day=b.Day;
}

class Person
{
private:
       char number;
    char sex;
    charID[19];
    int birthday;
public:
 Person(){};
 Person::Person(int n,int y,int m,int d,char s='m',char id[19]):birthday(y,m,d)
 {number=n;
 sex=m;
 strpcy(ID,id);
 }
 ~Person(){};


 
 
   
 

 Person(Person &p)
 {
number=p.number;
 sex=p.sex;
 birthday=p.birthday;
 strpcy(ID,p.id);
 }
 void input();
 void output();
};
void Person::input()
{cout<<"录入数据"<<endl;
cout<<"编号"<<endl;
cin>>number;
cout<<"性别"<<endl;
cin>>(m||f);
cout<<"生日"<<endl;
cout<<"身份证号"<<endl;
cin>>ID;
ID[18]='0';
}
void Person::output();
cout<<"编号"<<number;
cout<<"性别"<<sex;
cout<<"生日"<<birthday;
cout<<"身份证号"<<ID<<endl;
}
void main()
{ Person p1
p1.input();
p1.output();
return(0);

}

谢谢啦！！！