demo_basic_euler.htm

来自「Delphi脚本控件」· HTM 代码 · 共 73 行

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

<body>

<h3>
LISPPA: Euler algorithm (paxBasic).
</h3>
<hr>

<blockquote>
<pre>
<font color="blue"><b>Function</b></font> Cycle(InitV, A)
  <font color="blue"><b>Dim</b></font>  P, Stack, U, V, result
  result = <font color="blue"><b>NULL</b></font>
  Stack = [InitV, <font color="blue"><b>NULL</b></font>]
  <font color="blue"><b>Do</b></font> <font color="blue"><b>Until</b></font> Stack = <font color="blue"><b>NULL</b></font>
    V = Stack(0)
    P = <font color="blue"><b>AddressOf</b></font> A(V)
    <font color="blue"><b>If</b></font> P <> <font color="blue"><b>NULL</b></font> <font color="blue"><b>Then</b></font>
      U = P(0)
      <font color="blue"><b>Reduced</b></font> P = P(1)
      Stack = [U, Stack]
      P = <font color="blue"><b>AddressOf</b></font> A(U)
      <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>If</b></font> P(0) = V <font color="blue"><b>Then</b></font>
          <font color="blue"><b>Reduced</b></font> P = P(1)
          <font color="blue"><b>Exit</b></font> <font color="blue"><b>Do</b></font>
        <font color="blue"><b>End</b></font> <font color="blue"><b>If</b></font>
        P = <font color="blue"><b>AddressOf</b></font> P(1)
      <font color="blue"><b>Loop</b></font>
    <font color="blue"><b>Else</b></font>
      <font color="blue"><b>Reduced</b></font> Stack = Stack(1)
      result = [V, result]
    <font color="blue"><b>End</b></font> <font color="blue"><b>If</b></font>
  <font color="blue"><b>Loop</b></font>
  <font color="blue"><b>Return</b></font> result
<font color="blue"><b>End</b></font> <font color="blue"><b>Function</b></font>

<font color="blue"><b>Dim</b></font> A[10], Path, P

A[1] = [2, [3, <font color="blue"><b>NULL</b></font>]]
A[2] = [1, [3, [7, [8, <font color="blue"><b>NULL</b></font>]]]]
A[3] = [1, [2, [4, [5, <font color="blue"><b>NULL</b></font>]]]]
A[4] = [3, [5, <font color="blue"><b>NULL</b></font>]]
A[5] = [3, [4, [6, [8, <font color="blue"><b>NULL</b></font>]]]]
A[6] = [5, [7, [8, [9, <font color="blue"><b>NULL</b></font>]]]]
A[7] = [2, [6, [8, [9, <font color="blue"><b>NULL</b></font>]]]]
A[8] = [2, [5, [6, [7, <font color="blue"><b>NULL</b></font>]]]]
A[9] = [6, [7, <font color="blue"><b>NULL</b></font>]]

Path = Cycle(1, A)

<font color="blue"><b>println</b></font> <font color="Red">"Euler path: "</font>
P = <font color="blue"><b>AddressOf</b></font> Path
<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)
<font color="blue"><b>Loop</b></font>
</pre>
</blockquote>

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