private and protected in c 2b 2b

1protected://means all sub classes and base class can access these functions and variables butcan't be accessed outside classes
2public://Pubic methods and variables can be accessed inside and outside of the class
3private://only entity class can read and write the variables exeption is friend

1class A 
2{
3public:
4    int x;
5protected:
6    int y;
7private:
8    int z;
9};
10 
11class B : public A
12{
13    // x is public
14    // y is protected
15    // z is not accessible from B
16};
17 
18class C : protected A
19{
20    // x is protected
21    // y is protected
22    // z is not accessible from C
23};
24 
25class D : private A    // 'private' is default for classes
26{
27    // x is private
28    // y is private
29    // z is not accessible from D
30};