继承与派生的基本概念

#include <bits/stdc++.h>
using namespace std;
//Dividing Line----------------------------------------------------------------------------------------
class CStudent
{
private:
    string name;
    string id;
    char gender;
    int age;
public:
    void SetInfo(const string &, const string &, const char &, const int &);
    void PrintInfo(void);
};
void CStudent::SetInfo(const string &_name, const string &_id, const char &_gender, const int &_age)
{
    name = _name;
    id = _id;
    gender = _gender;
    age = _age;
}
void CStudent::PrintInfo(void)
{
    cout << "Name: " << name << endl;
    cout << "Id: " << id << endl;
    cout << "Gender: " << gender << endl;
    cout << "Age: " << age << endl;
}
//Dividing Line--------------------------------------------------------------------------
class CUnderGraduate : public CStudent
{
private:
    string major;
public:
    void SetInfo(const string &, const string &, const char &, const int &, const string &);
    void PrintInfo(void);
};
void CUnderGraduate::SetInfo(const string &_name, const string &_id, const char &_gender, const int &_age, const string &_major)
{
    CStudent::SetInfo(_name, _id, _gender, _age);
    major = _major;
}
void CUnderGraduate::PrintInfo(void)
{
    CStudent::PrintInfo();
    cout << "Major: " << major << endl;
}
//Dividing Line-----------------------------------------------------------------------------------------------------
int main(void)
{
    CUnderGraduate c;
    c.SetInfo("Hermann", "21200319", 'M', 19, "Computer Science");
    c.PrintInfo();
    return 0;
}