public Online(ReadingMaterial material, string title)
{
Author = material.Author;
Language = material.Language;
NumberOfPages = material.NumberOfPages;
Price = material.Price;
PostTitle = title;
}
public Book(ReadingMaterial material, bool isHardCover, string title)
{
Author = material.Author;
Language = material.Language;
NumberOfPages = material.NumberOfPages;
Price = material.Price;
IsHardCover = isHardCover;
BookTitle = title;
}
public Magazine(ReadingMaterial material, string issueFreq, int issueNum)
{
Author = material.Author;
Language = material.Language;
NumberOfPages = material.NumberOfPages;
Price = material.Price;
IssueNumber = issueNum;
IssueFrequency = issueFreq;
}