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Doubly-linked list/Element definition: Difference between revisions

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Doubly-linked list/Element definition (view source)

Revision as of 05:29, 28 August 2016

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=={{header|REXX}}==
REXX doesn't have linked lists, as there are no pointers (or handles).
<br>However, linked lists can be simulated with lists in REXX.▼
<br>
 
▲However, linked lists can be simulated with lists in REXX.
╔═════════════════════════════════════════════════════════════════════════╗
┌────────────────────────────────────────────────────────────────────┐
┌─┘ ║ ☼☼☼☼☼☼☼☼☼☼☼ Functions of the List Manager ☼☼☼☼☼☼☼☼☼☼☼ └─┐║
│ ║ @init ─── initializes the List. │║
│ @init ─── initializes║ the List. │ ║
│ ║ @size ─── returns the size of the List [could be a 0 (zero)]. │║
└─┐ ║ ┌─┘ ║▼
│ @size ─── returns the size of the List [could be 0 (zero)]. │
│ ║ @show ─── shows (displays) the complete List. │║
│ @show ║ @show k,1 ─── shows (displays) the complete ListKth item. │ ║
│ @get ║ @show k,m ─── returnsshows the(displays) M items, starting with the Kth item. │║▼
│ @show k,1 ─── shows (displays) the Kth item. │
│ ║ @show k,m ,─1 ─── shows (displays) the complete MList backwards. items, starting with Kth item. │║
║ ║
│ @show ,,─1 ─── shows (displays) the complete List backwards. │
│ ║ @get k ─── returns the Kth item. │║
│ @get k ─── returns the Kth item. ║ @get k,m ─── returns the M items starting with the Kth item. │║
║ ║
▲ │ @get k,m ─── returns the M items starting with the Kth item. │
│ ║ @put x ─── adds the X items to the end (tail) of the List. │║
│ ║ @put x ,0 ─── adds the X items to the end start (tailhead) of the List. │║
│ ║ @put x,0k ─── adds the X items to the start (head)before of the List Kth item. │ ║
║ ║
│ @put x,k ─── adds the X items to before of the Kth item. │
│ ║ @del k ─── deletes the item K. │║
│ @del k ─── deletes the item K. ║ @del k,m ─── deletes the M items starting with item K. │║
╚═════════════════════════════════════════════════════════════════════════╝
│ @del k,m ─── deletes the M items starting with item K. │
▲ └─┐ ┌─┘
└────────────────────────────────────────────────────────────────────┘
<lang rexx>/*REXX program that implements various List Manager functions. */
call sy 'initializing the list.' ; call @init
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