−目錄表

國立屏東大學 資訊工程學系 物件導向程式設計

Person類別範例7

類別繼承

簡介

Person類別是用以對「真實世界(real world)」中的「人」進行「抽象對映(mapping abstraction)」的定義。

Data Members

Member Functions

Constructor and Destructor

Student類別範例

簡介

Student是繼承自Person類別的類別，用以對「真實世界(real world)」中的「學生」進行「抽象對映(mapping abstraction)」的定義。但比起Person類別，Student類別又更為特別一些，它還多了一個名為ID的data member及相關的setter與getter:

Data Members

Member Functions

Constructor and Destructor

None

Source Code

person.h
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
#include <iostream>
using namespace std;
 
#ifndef _PERSON_
#define _PERSON_
 
class Person
{
private:
  string firstname;
  string lastname;
 
public: 
  Person();
  Person(string, string);
  ~Person();
  void showInfo();
   
  void set_firstname(string fn);
  string get_firstname();
   
  void set_lastname(string ln);
  string get_lastname(); 
};
#endif

person.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
#include "person.h"
 
Person::~Person()
{
  cout << "A Person is removed." << endl;
}
 
Person::Person()
{
  cout << "A Person is created." << endl;
}
 
Person::Person(string fn, string ln)
{
  firstname=fn;
  lastname=ln;
}
 
void Person::showInfo()
{
  cout << "Name: " << firstname << " " << lastname << endl;
}
 
void Person::set_firstname(string fn)
{
  firstname=fn;
}
 
void Person::set_lastname(string ln)
{
  lastname=ln;
}
 
string Person::get_firstname()
{
  return firstname;
}
 
string Person::get_lastname()
{
  return lastname;
}

student.h
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
#ifndef _STUDENT_
#define _STUDENT_
#include "person.h"
 
class Student : public Person
{
private:
  string ID;
   
public:
  Student();
  Student(string fn, string ln, string id);
  ~Student();
  void set_ID(string id);
  string get_ID();
};
#endif

student.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
#include "student.h"
 
Student::Student()
{
  cout << "A Student is created." << endl;
}
 
/*
Student::Student(string fn, string ln, string id):Person(fn, ln)
{
  ID=id;
}
*/
 
Student::Student(string fn, string ln, string id):Person(fn, ln), ID(id)
{
//  ID=id;
}
 
Student::~Student()
{
  cout << "A Student is removed." << endl;
}
 
void Student::set_ID(string id)
{
  ID=id;
}
 
string Student::get_ID()
{
  return ID;
}

main.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
#include <iostream>
using namespace std;
 
#include "student.h"
 
int main()
{
  Student *amy = new Student("Amy", "Chang", "s111418099");
  amy->showInfo();
  delete amy;
   
  return 0;
}

Makefile
1
2
3
4
5
6
7
8
9
10
11
all: person.o student.o
    g++ main.cpp person.o student.o -o main
 
person.o: person.cpp person.h
    g++ -c person.cpp
     
student.o: student.cpp student.h
    g++ -c student.cpp
 
clean:
    rm -f *.o main *.*~ *~