demo_pascal_euler.htm

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<link rel=stylesheet type="text/css" href="styles.css">
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<h3>
LISPPA: Euler algorithm (paxPascal).
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<blockquote>
<pre>
<font color="blue"><b>program</b></font> EulerAlgorithm;

<font color="blue"><b>function</b></font> Cycle(InitV, A: Variant): Variant;
<font color="blue"><b>var</b></font>
  P, Stack, U, V;
<font color="blue"><b>begin</b></font>
  result := <font color="blue"><b>nil</b></font>;
  Stack := [InitV, <font color="blue"><b>nil</b></font>];
  <font color="blue"><b>while</b></font> Stack <> <font color="blue"><b>nil</b></font> <font color="blue"><b>do</b></font>
  <font color="blue"><b>begin</b></font>
    V := Stack[0];
    P := @ A[V];
    <font color="blue"><b>if</b></font> P <> <font color="blue"><b>nil</b></font> <font color="blue"><b>then</b></font>
    <font color="blue"><b>begin</b></font>
      U := P[0];
      <font color="blue"><b>reduced</b></font> P := P[1];
      Stack := [U, Stack];
      P := @ A[U];
      <font color="blue"><b>while</b></font> P <> <font color="blue"><b>nil</b></font> <font color="blue"><b>do</b></font>
      <font color="blue"><b>begin</b></font>
        <font color="blue"><b>if</b></font> P[0] = V <font color="blue"><b>then</b></font>
        <font color="blue"><b>begin</b></font>
          <font color="blue"><b>reduced</b></font> P := P[1];
          <font color="blue"><b>break</b></font>;
        <font color="blue"><b>end</b></font>;
        P := @ P[1];
      <font color="blue"><b>end</b></font>;
    <font color="blue"><b>end</b></font>
    <font color="blue"><b>else</b></font>
    <font color="blue"><b>begin</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>end</b></font>;
<font color="blue"><b>end</b></font>;

<font color="blue"><b>var</b></font> 
  A[10], Path, P: Variant;

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

  Path := Cycle(1, @ A);

  writeln(<font color="Red">'Euler path:'</font>);
  P := @ Path;
  <font color="blue"><b>while</b></font> P <> <font color="blue"><b>nil</b></font> <font color="blue"><b>do</b></font>
  <font color="blue"><b>begin</b></font>
    writeln(P[0]);
    P := @ P[1];
  <font color="blue"><b>end</b></font>;
<font color="blue"><b>end</b></font>.
</pre>
</blockquote>

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