链节

1.插入：

WHILE（more data）

      Read (value and next 'p')

      Insert(mylist,value and next 'p'）

Reset（list）

Write "Items in the list are"

2.删除

Find( next 'p' in list)

Delete (next 'l' behind 'p' in list)

Reset(list)

Write "items in the list are"