C++ 4.정적멤버 static

-정적멤버 static

 

//Student.h

#pragma once

#include <iostream>

 

class Student

{

        int num;

        static int last_num; //정적 멤버 필드

public:

        Student(void);

        int GetNum();

        static int GetLastNum(); //정적 멤버 메소드

};

 

//Student.cpp

#include "Student.h"

int Student::last_num; //static 멤버 필드는 멤버 필드선언을 해야함. 선언문에서는 static 키워드 사용 안 함

 

Student::Student(void)

{

        last_num++;

        num = last_num;

}

 

int Student::GetNum()

{

        return num;

}

 

int Student::GetLastNum() //static 멤버 메소드 구현 정의에서는 static키워드 사용 안 함

{

        return last_num;

}

//Program.cpp

#include "Student.h"

using namespace std;

 

int main(void)

{

        cout<<"현재 학생 수:"<<Student::GetLastNum()<<endl;

        Student *stu = new Student();

        cout<<"학생번호:"<<stu->GetNum()<<endl;

 

        cout<<"현재 학생 수:"<<Student::GetLastNum()<<endl;

 

        Student *stu2 = new Student();

        cout<<"학생번호:"<<stu2->GetNum()<<endl;

 

        delete stu;

        delete stu2;

 

        for(int i = 0 ; i < 15; i++)

        {

               cout<<"현재 학생 수:"<<Student::GetLastNum()<<endl;

                stu = new Student();

               cout<<"학생 번호:"<<stu->GetNum()<<endl;

               delete stu;

        }

        return 0;

}