demo_basic_lists.htm

来自「Delphi脚本控件」· HTM 代码 · 共 105 行

HTM
105 行
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<html>
<head>
<link rel=stylesheet type="text/css" href="styles.css">
</head>

<body>

<h3>
LISPPA: Linked lists (paxBasic).
</h3>
<hr>

<blockquote>
<pre>
<font color="blue"><b>Dim</b></font> I, L, P

<font color="blue"><b>println</b></font> <font color="Red">"Create a list"</font>
L = [100, [200, [300, <font color="blue"><b>NULL</b></font>]]]
<font color="blue"><b>println</b></font> L

<font color="blue"><b>println</b></font> <font color="Red">"Insert new item at the beginning"</font>
L = [50, L]
<font color="blue"><b>println</b></font> L

<font color="blue"><b>println</b></font> <font color="Red">"Add new item at the end"</font>
P = <font color="blue"><b>AddressOf</b></font> L ' Create alias of L
<font color="blue"><b>Do</b></font> <font color="blue"><b>Until</b></font> P = <font color="blue"><b>NULL</b></font> ' Find last item
 P = <font color="blue"><b>AddressOf</b></font> P(1)
<font color="blue"><b>Loop</b></font>
P = [400, <font color="blue"><b>NULL</b></font>] ' Add new item
<font color="blue"><b>println</b></font> L

<font color="blue"><b>println</b></font> <font color="Red">"Insert new item at the middle"</font>
P = <font color="blue"><b>AddressOf</b></font> L(1)
P = <font color="blue"><b>AddressOf</b></font> P(1)  ' insert before 200
P = [150, P]
<font color="blue"><b>println</b></font> L

<font color="blue"><b>println</b></font> <font color="Red">"Print list"</font>
P = <font color="blue"><b>AddressOf</b></font> L ' create alias of L
<font color="blue"><b>Do</b></font> <font color="blue"><b>Until</b></font> P = <font color="blue"><b>NULL</b></font>
  <font color="blue"><b>println</b></font> P(0)
  P = <font color="blue"><b>AddressOf</b></font> P(1) ' go to the next item
<font color="blue"><b>Loop</b></font>

<font color="blue"><b>println</b></font> <font color="Red">"Delete the first item of the list"</font>
<font color="blue"><b>Reduced</b></font> L = L(1)
<font color="blue"><b>println</b></font> L

<font color="blue"><b>println</b></font> <font color="Red">"Delete the last item of the list"</font>
P = <font color="blue"><b>AddressOf</b></font> L ' Create alias of L
<font color="blue"><b>Do</b></font> <font color="blue"><b>Until</b></font> P(1) = <font color="blue"><b>NULL</b></font>
  P = <font color="blue"><b>AddressOf</b></font> P(1) ' Find last item
<font color="blue"><b>Loop</b></font>
<font color="blue"><b>reduced</b></font> P = P(1)
<font color="blue"><b>println</b></font> L

<font color="blue"><b>println</b></font> <font color="Red">"Delete item at the middle of the list"</font>
P = <font color="blue"><b>AddressOf</b></font> L
P = <font color="blue"><b>AddressOf</b></font> P(1)
<font color="blue"><b>reduced</b></font> P = P(1)
<font color="blue"><b>println</b></font> L

<font color="blue"><b>println</b></font> <font color="Red">"Delete all items from the list"</font>
<font color="blue"><b>Do</b></font> <font color="blue"><b>Until</b></font> L = <font color="blue"><b>NULL</b></font>
  <font color="blue"><b>Reduced</b></font> L = L(1)
<font color="blue"><b>Loop</b></font>
<font color="blue"><b>println</b></font> L

<font color="blue"><b>println</b></font> <font color="Red">"Create a cycled list"</font>
L = [100, [200, [300, <font color="blue"><b>NULL</b></font>]]]
L[1][1][1] = <font color="blue"><b>AddressOf</b></font> L
<font color="blue"><b>println</b></font> L

<font color="blue"><b>delete</b></font> L

<font color="blue"><b>println</b></font> <font color="Red">"Another way to create a cycled list"</font>
L = [100, [200, [300, <font color="blue"><b>NULL</b></font>]]]
P = <font color="blue"><b>AddressOf</b></font> L ' Create alias of L
<font color="blue"><b>Do</b></font> <font color="blue"><b>Until</b></font> P = <font color="blue"><b>NULL</b></font> ' Find last item
 P = <font color="blue"><b>AddressOf</b></font> P(1)
<font color="blue"><b>Loop</b></font>
<font color="blue"><b>TerminalOf</b></font> P = <font color="blue"><b>AddressOf</b></font> L ' join head and tail of the list
<font color="blue"><b>println</b></font> L

<font color="blue"><b>println</b></font> <font color="Red">"Print the cycled list"</font>
P = <font color="blue"><b>AddressOf</b></font> L
I = 0
<font color="blue"><b>Do</b></font>
  <font color="blue"><b>println</b></font> P[0]
  P = <font color="blue"><b>AddressOf</b></font> P[1]
  I += 1
<font color="blue"><b>Loop</b></font> <font color="blue"><b>Until</b></font> I = 15
</pre>
</blockquote>

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