#include 
     
       #include 
      
        using namespace std; class Person {
    public:     Person( string aName=“”, bool aSex=true, int aAge=0 );     void display() const; protected:     string m_strName;     bool m_bSex;     int m_iAge; }; Person::Person( string aName,bool aSex,int aAge )    :m_strName(aName), m_bSex(aSex), m_iAge(aAge) {
    } void Person::display() const {
        cout << m_strName << endl;     string sex;     if( m_bSex )         sex = "male";     else         sex = "famale";     cout << sex << endl;     cout << m_iAge << endl; } class Teacher: public Person {
    public:     Teacher( string aName, int aSex, int aAge, string aAddr, string aMajor, int aSalary );     void displayEx() const; protected:     string m_strAddr;     string m_strMajor;     int m_iSalary; }; Teacher::Teacher( string aName, bool aSex, int aAge, string aAddr,string aMajor,int aSalary ):Person( aName, aSex, aAge ), m_strAddr(aAddr), m_strMajor(aMajor),m_iSalary(aSalary)//这里用不着写“:m_strName(aName), m_bSex(aSex), m_iAge(aAge)” {
    } void Person::displayEX() const {
        display();     cout << m_strAddr << endl;     cout << m_strMajor << endl;     cout << m_iSalary << endl; }