最佳答案

#include <iostream>
using namespace std;

class Cat {
static int numOfCats;
int ID;
public:
Cat() { ID = numOfCats++; }
Cat(const Cat& r) { ID = r.ID; numOfCats++; }
~Cat() { --numOfCats; cout << numOfCats << endl; }
static void getNumOfCats()
{ cout << "Number of Cats: " << Cat::numOfCats << endl; }
void getNumOfCats_v2() const
{ cout << "Number of Cats: " << Cat::numOfCats << endl; }
void Print() const { cout << "Cat No. " << ID << endl; }
};

int Cat::numOfCats = 0;

int main() {
Cat a;
a.Print();
Cat::getNumOfCats();
Cat b(a);
Cat::getNumOfCats();
Cat c[3];
Cat::getNumOfCats();
c[0].getNumOfCats_v2();
}

程序的输出如下：

Cat No. 0
Number of Cats: 1
Number of Cats: 2
Number of Cats: 5
Number of Cats: 5
4
3
2
1
0

从中能够看出，读取静态成员的方法不一定也要是静态方法。