static method in C++

In C++, static method is called static member function. 
A static member function can be called even if no objects of the class exist and the static function are accessed using only the class name and the scope resolution operator ::.
```
#include <iostream>
using namespace std;

class A {
private:
    static int val;
public:
    static void say() { cout << val << endl; }
    void say2() { cout << val << endl; }
};
int A::val{1};

int main() {
    A::say();
    A a;
    a.say2();
    return 0;
}
#include <iostream>
using namespace std;

class A {
private:
    static int val;
public:
    static void say() { cout << val << endl; }
    void say2() { cout << val << endl; }
};
int A::val{1};

int main() {
    A::say();
    A a;
    a.say2();
    return 0;
}

/*
1 
1 
*/
```
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