Wikipedia. Luhn formula. Code examples

Can I trust wikipedia code examples ? From today I don't. The famous Luhn formula to check credit card number has different implementations, listed at the end of the article. One small problem, though: C# implementation always returns false, Java implementation always returns true. C# code looks accurate, but I think they should do some test work before publishing.

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The great thing about wikipedia is that you can submit a link to a revised sample (or the sample itself I suppose). You don't have to of course, but that's the idea anyway.

Michael: Why do you think it's great ?