public List <PopularBook> GetMostPopularBooksByAgeGroup()
{
var allPopularBooks = new List <PopularBook>();
var allBooksBorrowedByAgeGroup = GetArrayWithListsOfAllBooksInEachAgeGroup();
int yearGroupLowestAge = 0;
int yearGroupMaxAge = 9;
for (int i = 0; i < 10; i++)
{
var mostPopularBookInAgeGroup = (from b in allBooksBorrowedByAgeGroup[i]
group b by b into grp
orderby grp.Count() descending
select grp.Key).FirstOrDefault();
if (mostPopularBookInAgeGroup != null)
{
var popularBook = new PopularBook();
popularBook.Book = mostPopularBookInAgeGroup;
popularBook.AgeGroupTenYearsFromThisAge = yearGroupLowestAge;
allPopularBooks.Add(popularBook);
}
yearGroupLowestAge += 10;
yearGroupMaxAge += 10;
}
return(allPopularBooks);
}
static void Main(string[] args)
{
PopularBook[] arr;
arr = new PopularBook[5];
for(int i=0;i<5;i++){
Console.WriteLine("Enter title: ");
string a =Console.ReadLine();
Console.WriteLine("Enter Auther: ");
string b =Console.ReadLine();
arr[i] =new PopularBook(a,b);
arr[i].display();
}
}
