Answer to Question #212031 in C++ for lily

Question

For this assignment, you are required to create a 2d dynamic array that stores the

following information about multiple books:

 The book name

 Its release year

 The total number of ratings (total number of people that have rated the book)

 The number of people that have given the book a 1-star rating

 The number of people that have given the book a 2-star rating

 The number of people that have given the book a 3-star rating

You are to write the following functions:

 A function to create a 2D array according to user provided dimensions

 A function to calculate the average rating.

 Display function to display all the details of a selected book

 A function to write the 2d array to a file called “BookLibrary.txt”.

Answer 1

#include <iostream>

using namespace std;

struct book {
  string name;
  int year;
  int totalNumber;
  int oneStar;
  int twoStar;
  int threeStar;
  
  double avgRate() {
    return (1.0 * oneStar + 2.0 * twoStar + 3.0 * threeStar) / totalNumber;  
  }
};

int main() 
{
  int numberOfBooks;
  cout << "Enter number of books: ";
  cin >> numberOfBooks;
  book books[numberOfBooks];
  for (int i = 0; i < numberOfBooks; i++) {
    cout << "Name:";
    cin >> books[i]->name;

    cout << "Release year:";
    cin >> books[i]->year;

    cout << "Total number:";
    cin >> books[i]->totalNumber;

    cout << "One Star:";
    cin >> books[i]->oneStar;

    cout << "Two Star:";
    cin >> books[i]->twoStar;

    cout << "Three Star:";
    cin >> books[i]->threeStar;
  }
  for (int i = 0; i < numberOfBooks; i++) {
    cout << (i + 1) << "). " << books[i].avgRate() << endl;
  }
  return 0;
}