friend关键字使用之员工和经理类-C++

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/*
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功能：实现员工和经理类
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作者：wind
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日期：2013-11-08
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*/
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#include <iostream>
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#include <string>
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using namespace std;
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int n=0,m=0;
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class Manager;
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//员工
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class Employee
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{
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public:
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  Employee(string iName=NULL,int iAge=NULL,int iYear=0,int iNum=0);
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  ~Employee(){};
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  void printOn(Employee&);
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  void retire();
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   friend Manager;
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private:
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  string m_iName;
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  int m_iAge;
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  int m_iYear;
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  int m_iNum;
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};
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//经理
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class Manager:public Employee
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{
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public:
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  Manager(string iName=NULL,int iAge=NULL,int iYear=0,int iNum=0,int ilevel = 0);
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  ~Manager(){};
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  void printOn(Manager&);
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  void retire();
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private:
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   int m_iLevel;
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};
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Employee::Employee(string iName,int iAge,int iYear,int iNum)
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{
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    m_iName=iName;
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  m_iAge=iAge;
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  m_iYear=iYear;
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  m_iNum=iNum;
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  n++;
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}
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Manager::Manager(string iName,int iAge,int iYear,int iNum,int ilevel)
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{
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  m_iName=iName;
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  m_iAge=iAge;
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  m_iYear=iYear;
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  m_iNum=iNum;
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  m_iLevel=ilevel;
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}
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void Employee::printOn(Employee&obj)
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{
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  cout<<obj.m_iName<<" "<<obj.m_iAge<<" "<<obj.m_iYear<<" "<<obj.m_iNum<<endl;
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}
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void Employee::retire()
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{
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  if (m_iAge>=55)
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  {
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    cout<<m_iName<<"超过了退休年龄，"<<m_iName<<"办理了退休手续"<<endl;
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    n--;
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  }
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}
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void Manager::printOn(Manager&obj)
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{
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  cout<<obj.m_iName<<" "<<obj.m_iAge<<" "<<obj.m_iYear<<" "<<obj.m_iNum<<endl;
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}
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void Manager::retire()
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{
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  if (m_iAge>=60)
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  {
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    cout<<m_iName<<"超过了退休年龄，"<<m_iName<<"办理了退休手续"<<endl;
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    m--;
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  }
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}
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int main(void)
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{
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  string name;
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  int age;
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  int year;
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  int num;
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  int level;
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  int i=0;
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  cout<<"请输入员工的姓名、年龄、工作年限和部门号:";
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  cin>>name>>age>>year>>num;
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  Employee a(name,age,year,num);
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  cout<<"请输入员工的姓名、年龄、工作年限和部门号:";
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  cin>>name>>age>>year>>num;
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  Employee b(name,age,year,num);
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    cout<<"请输入经理的姓名、年龄、工作年限和部门号、级别：";
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  cin>>name>>age>>year>>num>>level;
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   Manager c(name,age,year,num,level);
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  cout<<"公司共有员工："<<n<<"人，"<<" 经理"<<m<<"人。";
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   a.retire();
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     b.retire();
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   c.retire();
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   cout<<"公司共有员工："<<n<<"人，"<<" 经理"<<m<<"人。";
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  system("pause");
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  return 0;
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}