c++设计一个人事管理的“人员”类。跪求帮忙改一下解决思路

c++设计一个人事管理的“人员”类。跪求帮忙改一下
#include<iostream>
using namespace std;
class people{
public:
void num();
void sex();
  void id();
  void date();
private:
int num;
char sex;
int id;
int date;
};


  people::num()
{cin>>num;
cout<<"num: "<<num<<endl;
}
people::sex()
{cin>>sex;
cout<<"sex: "<<sex<<endl;
}
people::id()
{cin>>id;
cout<<"id:"<<id<<endl;
}

class Date{
public:
void setDate(int newY=0,int newM=0,int newD=0);
void showDate();
private:
int year,mouth,day;
};
void Date::setDate(int newY,int newM,int newD){
year=newY;
mouth=newM;
day=newD;
}
inline void Date::showDate(){
cout<<year<<":"<<mouth<<":"<<day<<endl;
}
int main()
{
people s;
s.num();
s.sex();
s.id();
s.date();}


[解决办法]

C/C++ code

#include <iostream.h>#include <stdio.h>class people{public:    void get_num();    void get_sex();    void get_id();    void get_date();private:    int num;    char sex;    int id;    int date;};void people::get_num(){    cin>>num;    cout<<"num: "<<num<<endl;}void people::get_sex(){    cin>>sex;    cout<<"sex: "<<sex<<endl;}void people::get_id(){    cin>>id;    cout<<"id:"<<id<<endl;}void people::get_date(){    cin>>date;    cout<<"date:"<<date<<endl;}class Date{public:    void setDate(int newY=0,int newM=0,int newD=0);    void showDate();private:    int year,mouth,day;};void Date::setDate(int newY,int newM,int newD){    year=newY;    mouth=newM;    day=newD;}inline void Date::showDate(){    cout<<year<<":"<<mouth<<":"<<day<<endl;}void main(){    people s;    s.get_num();    s.get_sex();    s.get_id();    s.get_date();                 }
[解决办法]
主要错误是标识符重名，函数和变量也是不能用同一个名字的。
C/C++ code
#include<iostream>using namespace std;class people{public:    void num();    void sex();    void id();    void date();private:    int _num;   /*标识符重名*/    char _sex;  /*标识符重名*/    int _id;    /*标识符重名*/    int _date;  /*标识符重名*/};void people::num()  /*少了void*/{    cin>>_num;         /*改名*/    cout<<"num: "<<_num<<endl;  /*改名*/}void people::sex()  /*同上*/{    cin>>_sex;    cout<<"sex: "<<_sex<<endl;}void people::id()   /*同上*/{    cin>>_id;    cout<<"id:"<<_id<<endl;}class Date{public:    void setDate(int newY=0,int newM=0,int newD=0);    void showDate();private:    int year,mouth,day;};void Date::setDate(int newY,int newM,int newD){    year=newY;    mouth=newM;    day=newD;}inline void Date::showDate(){    cout<<year<<":"<<mouth<<":"<<day<<endl;}int main(){    people s;    s.num();    s.sex();    s.id();    s.date();}