Talk:Interpreter pattern: Difference between revisions

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What does the link "Block (Java programming language)" mean? It points to nowhere. [[User:Lathspell|Lathspell]] 18:12, 18 February 2006 (UTC)

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--[[Special:Contributions/98.225.38.255|98.225.38.255]] ([[User talk:98.225.38.255|talk]]) 23:25, 13 February 2010 (UTC) I think the C# (and probably Java version is wrong). The problem is in Evaluator function, the left and right operands are switched. If you compute 6 - 4 or 6 4 - , the result that you get is 4 - 6. The solution is

<syntaxhighlight lang="text">

<code>

IExpression r = stack.Pop();

IExpression l = stack.Pop();

stack.Push(new Plus(l, r));

</syntaxhighlight>

</code>

instead of

<syntaxhighlight lang="text">

<code>

stack.Push(new Plus(stack.Pop(), stack.Pop()));

</syntaxhighlight>

</code>

Corrected code:

<syntaxhighlight lang="text">

<code>

public Evaluator(string expression)

{

Line 45 ⟶ 47:

syntaxTree = stack.Pop();

}

</syntaxhighlight>

</code>