what does the following mean? class A: private B

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I need help with a C++ project. I need to finish the program. The program is supposed to shuffle and deal a deck of cards. Here is what I am given: This is Card.h: #ifndef CARD_H#define CARD_H#include <string>class Card {public:static const size_t FACES{13}; // total number of facesstatic const size_t SUITS{4}; // total number of suitsenum class Face {Ace, Deuce, Three, Four, Five, Six, Seven, Eight,Nine, Ten, Jack, Queen, King};enum class Suit {Hearts, Diamonds, Clubs, Spades};Card(Face cardFace, Suit cardSuit); // initialize face and suitstd::string toString() const; // returns a string representation of a Card// get the card's faceFace getFace() const {return face;}// get the card's suitSuit getSuit() const {return suit;}private:Face face;Suit suit;static const std::string faceNames[FACES];static const std::string suitNames[SUITS];};#endif   This is DeckOfCards.h: #ifndef DECK_OF_CARDS_H#define DECK_OF_CARDS_H#include <vector>#include "Card.h"// DeckOfCards class…

Can you help me with this code for C++ please:  Modify the class Song you created for part 2  bydoing the following:(a) Add a default constructor that initializes the song to have invalid astitle and artist, and −1 as recording year.(b) Add a constructor Song(title) that initializes the song to thegiven title (that is, to the title given as argument). The artist andrecording year are initialized to unknown and −1, respectively. Theargument is a string.(c) Add a constructor Song(title, artist, year) that initializesthe song to the given title, artist and recording year. The first twoarguments are strings, the third one is an integer.(d) Replace the function equals(s1, s2) by a methodequals(other) that returns true if the receiver and theargument have the same title, artist and recording year.(e) Add a method less_than(other) that returns true if the title ofthe first song is less than the title of the second song. In case the titlesof the two songs are identical, the method returns true…