C++（十二）类的继承（简单继承）

文章目录

• ​​Student.hpp​​
• ​​Student.cpp​​
• ​​main.cpp​​

实现了学生类，派生了小学生类，实现如下：

头文件

源文件（截取构造函数部分）

Student.hpp

#pragma once
#include <string>

class Student
{
private:
  std::string name;
  int stu_no;

public:
  Student(const std::string& _name = "none", int _stu_no = 0);

  void SetName(std::string _name);
  void SetStuNo(float _stu_no);
  std::string GetName();
  float GetStuNo();
  void Print_Student_info();
};

class Primary_Student : public Student
{
private:
  float language;
  float math;

public:
  Primary_Student(float _la = 0.0,float _ma = 0.0,const std::string& _name = "none",int _stu_no = 0);
  Primary_Student(float _la,float _ma,const Student& stu);
  float average();
};

Student.cpp

#include "Student.h"
#include <iostream>
using namespace std;


//基类构造函数
Student::Student(const string& _name, int _stu_no) :name(_name), stu_no(_stu_no) {}

//派生类构造函数
Primary_Student::Primary_Student(
  float _la,float _ma,
  const std::string& _name,int _stu_no
  ) : Student(_name, _stu_no)
{
  language = _la;
  math = _ma;
}

//派生类构造函数
Primary_Student::Primary_Student(
  float _la,float _ma,const Student& stu
) :Student(stu), language(_la), math(_ma){}


void Student::SetName(std::string _name) {
  this->name = _name;
}

void Student::SetStuNo(float _stu_no) {
  this->stu_no = _stu_no;
}

string Student::GetName() {
  return name;
}

float Student::GetStuNo() {
  return stu_no;
}

void Student::Print_Student_info() {
  cout << "Name=" << name << " stu_no=" << stu_no << endl;
}

float Primary_Student::average() {
  float _average = (language + math) * 0.50;
  return _average;
}

main.cpp

#include "Student.h"
#include <iostream>
using namespace std;

int main(int argc, char* argv[]) {
  Student stu1("鲁班", 001);
  Student stu2;
  stu2.SetName("狄仁杰");
  stu2.SetStuNo(002);

  cout << "Name=" << stu1.GetName() << " stu_no=" << stu1.GetStuNo() << endl;
  cout << "Name=" << stu2.GetName() << " stu_no=" << stu2.GetStuNo() << endl;
  stu2.Print_Student_info();

  Primary_Student pri_stu1(88.0, 85.1, "蔡文姬", 3);
  Primary_Student pri_stu2(88.0, 85.1, "亚索",  4);
  Primary_Student pri_stu3(88.0, 85.1, stu2);

  cout << pri_stu1.GetName() << "\t average = " << pri_stu1.average() << endl;
  cout << pri_stu2.GetName() << "\t average = " << pri_stu2.average() << endl;
  cout << pri_stu3.GetName() << "\t average = " << pri_stu3.average() << endl;

  pri_stu1.Print_Student_info();
  pri_stu2.Print_Student_info();
  pri_stu3.Print_Student_info();
}

截图演示：