Cause : the value entered is larger than the maximum width defined for the column 可是我给与负值的两个参数都没有大于它的最大宽度呀？
2.
This book elaborate every step in details . you seldom find a book which explains in detail and yet for beginner . this is the reason i rate 5 这本书详尽的讲解了每一个步骤，你很少能发现一本书如本书一样为初学者解释得如此透彻。这就是为什么我给与本书5颗星的评价。
