C++ | Static Keyword | Question 2

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#include <iostream>
using namespace std;
  
class Player
{
private:
    int id;
    static int next_id;
public:
    int getID() { return id; }
    Player()  {  id = next_id++; }
};
int Player::next_id = 1;
  
int main()
{
  Player p1;
  Player p2;
  Player p3;
  cout << p1.getID() << " ";
  cout << p2.getID() << " ";
  cout << p3.getID();
  return 0;
}

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(A) Compiler Error
(B) 1 2 3
(C) 1 1 1
(D) 3 3 3
(E) 0 0 0


Answer: (B)

Explanation: If a member variable is declared static, all objects of that class have access to a single instance of that variable. Static variables are sometimes called class variables, class fields, or class-wide fields because they don’t belong to a specific object; they belong to the class.

In the above code, static variable next_id is used to assign a unique id to all objects.


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