define book class with member function and store value

Question

Can someone please help me with the below requirement

Class book that that contains attributes BookId, BookName, and Price. It also contain member function to input and show its attributes.

Write another class Writer that contains that contains the attributes of WriterName, Address and NumberofBooks written by him. It contains array of book objects as iys member. The length of array should be 5 to store the data of five books. It should also contain a member function to input and display its attributes.

I found a solution on google with below code but it appears it is useful for my half requirement.

#include<iostream.h>
#include<stdio.h>
#include<conio.h>
class BOOK
{
    int BOOKNO;
    char BOOKTITLE[20];
    float PRICE;
    void TOTAL_COST(int N)
    {
        float tcost;
        tcost=PRICE*N;
        cout<<tcost;
    }
public:
    void INPUT()
    {
        cout<<"Enter Book Number ";
        cin>>BOOKNO;
        cout<<"Enter Book Title ";
        gets(BOOKTITLE);
        cout<<"Enter price per copy ";
        cin>>PRICE;
    }

    void PURCHASE()
    {
        int n;
        cout<<"Enter number of copies to purchase ";
        cin>>n;
        cout<<"Total cost is ";
        TOTAL_COST(n);
    }
};

void main()
{
    BOOK obj;
        obj.INPUT();
        obj.PURCHASE();
        getch();
    }

Answer 1

To contain an instance of an object you declare a member of that type in your class:

class Writer
{
  const size_t MAX_BOOKS_WRITTEN = 5U;
  Book         books_written[MAX_BOOKS_WRITTEN];
};

In the above class, "that contains that contains" an array of books written.