类的静态函数成员可以不创建类直接访问

#include "iostream"

using namespace std;

class base
{
    public:
    static void show()
    {
        cout << "hello world" << endl;
    }
};


int main()
{
    base::show();
}

类的静态函数成员不能访问非静态成员

class base
{
    public:
    static void show()
    {
        cout << a << endl;
        cout << b << endl;
        cout << c << endl;
    }
    int a;
    int b;
    static int  c;
};