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I am beginner of LaTeX, and wondering how to write functions or procedures in pseudocode. Is there any existing environment for that?

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Try the algorithm2e package (which you already tagged :-) ) – Martin Scharrer Jul 13 '11 at 14:59
There's also algorithmicx – egreg Jul 13 '11 at 15:02
what to write in latex... is there any examples? – Richard Jul 13 '11 at 15:08
LaTeX is about reading documentation. You should do it too. – Andrey Vihrov Jul 13 '11 at 15:12
up vote 2 down vote accepted

For what it's worth, I'm posting a summary of the comments as an answer.

There are several LaTeX packages for typesetting pseudocode. The most prominent are, in no particular order:

The listings package also has an experimental feature called literate programming with similar goals.

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