public static void Main()
Console.WriteLine("Hello World");
book b1=new book("lover",151,"adan");
public book(string title,int isbn,string author)
Console.WriteLine("title: {0}",title);
Console.WriteLine("isbn :{0}",isbn);
Console.WriteLine("author: {0}",author);
public void settitle(string title)
public void setisbn(int isbn)
public string getauthor()
public void setauthor(string author)