派生 Derive和 继承 Inheritance是一个概念
只是站的角度不同
继承是儿子接收父亲的产业
派生是父亲把产业传承给儿子

子类 和 父类 
基类 和 派生类

派生类除了拥有基类的成员
还可以定义自己的新成员，以增强类的功能



#include "iostream"
using namespace std;

//基类 Pelple
class People{
public:
    void setname(char *name);
    void setage(int age);
    char *getname();
    int getage();
private:
    char *m_name;
    int m_age;
};
void People::setname(char *name){ m_name = name; }
void People::setage(int age){ m_age = age; }
char* People::getname(){ return m_name; }
int People::getage(){ return m_age;}


//派生类 Student
class Student: public People{
public:
    void setscore(float score);
    float getscore();
private:
    float m_score;
};
void Student::setscore(float score){ m_score = score; }
float Student::getscore(){ return m_score; }


int main(){
    Student student;
    student.setname("tiger");
    student.setage(9);
    student.setscore(98.8f);
    cout << student.getname() << " age=" << student.getage() << ",score=" << student.getscore() << endl;
    return 0;
}


g++ drivedemo.cpp

student.setname("tiger");
编译警告
warning: conversion from string literal to 'char *' is deprecated [-Wc++11-compat-deprecated-writable-strings]
      
字符串字面量 是常量 不可修改 ， 赋值给 char* 会警告
所有 char * 前面加上  const
改为 const char *

完整代码
https://gitee.com/dyyx/hellocode/blob/master/web/tech/cpp/demo/drivedemo.cpp