Access Modifiers

Three types of access modifiers :

public :
Accessibility :
- inside the same class
- inside derived class
- outside the class
private (default)
Accessibility :
- inside the same class
protected :
Accessibility :
- Inside the same class
- Inside the derived class

Special Mention

A friend is a function or class that is allowed to access the private and protected member of another class.
Friend Function :

cpp

class A{
  private:
  int x = 10;

  friend void show(A obj);
}

void show(A obj){
  cout<<obj.x;
}

Friend Class :

cpp

class A{
  private:
  int x = 10;

  friend class B;
}

class B{
  public :
  void display(A obj){
    cout<<obj.x;
  }
}