static void Main(string[] args)
{
Book bk = new Book();//错误 Book bk;
bk.Price = 10.01;
bk.Title = "MatLab";
bk.Author = "Tom";
PrintBook(bk);
ChangeBook(bk);
PrintBook(bk);
}
static void PrintBook(Book bk)
{
Console.WriteLine("Book Infor:\nPrice={0},Tile={1},Author={2}",
bk.Price, bk.Title, bk.Author);
}
static void ChangeBook(Book bk)
{
bk.Price = 1.01;
bk.Title = "Spss";
bk.Author = "John";
}