Difference between Static variable declared in different scopes

Question

What is the difference between declaring static variable inside a block and outside a block in a file? Eg, here, what is difference between static variables a,b,c,d? Can we

Answer 1

The following worked for me:

/*
 * How to create an object on the stack.
 * Also make sure that only 5 objects are created for the class
*/

#include 

using namespace std;

class User {
private:
    int id;
    static int counter;
    static bool isOk;
public:
    User();
    ~User() {}
    int getId() { return id; }
    static int getCounter() { return counter; }
    static bool getStatus() { return isOk; }
    static void resetOk() { isOk = false; }
    static void setOk() { isOk = true; }
};

User::User() {
    if(counter == 5) {
        cout << "Not allowed to create more than 5 objects" << endl;
        resetOk();
        return;
    }
    counter++;
    id = counter;
    setOk();
}

int User::counter = 0;
bool User::isOk = false;

int main()
{
    // Create objects on stack
    User user1;
    (User::getStatus()) ? cout << "user1 id: " << user1.getId() << endl :
                          cout << "Object Construction Failed" << endl;
    User user2;
    (User::getStatus()) ? cout << "user2 id: " << user2.getId() << endl :
                          cout << "Object Construction Failed" << endl;
    User user3;
    (User::getStatus()) ? cout << "user3 id: " << user3.getId() << endl :
                          cout << "Object Construction Failed" << endl;
    User user4;
    (User::getStatus()) ? cout << "user4 id: " << user4.getId() << endl :
                          cout << "Object Construction Failed" << endl;
    User user5;
    (User::getStatus()) ? cout << "user5 id: " << user5.getId() << endl :
                          cout << "Object Construction Failed" << endl;
    User user6;
    (User::getStatus()) ? cout << "user6 id: " << user6.getId() << endl :
                          cout << "Object Construction Failed" << endl;
    User user7;
    (User::getStatus()) ? cout << "user7 id: " << user7.getId() << endl :
                          cout << "Object Construction Failed" << endl;

    return 0;
}