C++中静态成员变量如何访问？

Question

class Tank
{
public:

    static int getCount()
    {
        return count;
    }

    static int count;//定义一个静态成员变量
};


int main(void)
{
    Tank::count = 0;

    //cout << Tank::getCount() << endl;   
    cout << Tank::count << endl;   //无法运行
    system("pause");
    return 0;
}

这段代码中，会出现链接错误，请问是哪里出错了？

Answer 1

Did you write the initialization wrong? It should be

int Tank::count = 0;
int main(void)
{
    cout << Tank::count << endl;   //无法运行
    system("pause");
    return 0;
}

Place initialization outside main.

Answer 2

Can you please put the statement at the front?

Answer 3

class Tank
{
public:

    static int getCount()
    {
        return count;
    }

    static int count;//声明一个静态成员变量
};

//定义并初始化count
int Tank::count = 0;

int main(void)
{
    
    Tank::count = 0;

    //cout << Tank::getCount() << endl;   
    cout << Tank::count << endl;   //无法运行
    system("pause");
    return 0;
}