[C++/8.10] 클래스와 static 변수 variable

static 변수는 cpp 파일에서만 선언한다.

#include<iostream>
using namespace std;

class Something
{
public:
    static int s_value;
};

int Something::s_value = 1; // define in cpp file(static 값일 경우.)

int main()
{
    cout << &Something::s_value << " -> " << Something::s_value << endl;
    
    for(int i=0; i<20; i++)
        cout << "-";
    cout << endl;

    Something st1;
    Something st2;

    st1.s_value = 2;
    cout << &st1.s_value << " -> " << st1.s_value << endl;
    cout << &st2.s_value << " -> " << st2.s_value << endl;

    for(int i=0; i<20; i++)
        cout << "-";
    cout << endl;

    Something::s_value = 1024;
    cout << &Something::s_value << " -> " << Something::s_value << endl;

    return 0;
}

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