# Hello World (LaTeX)

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Since LaTeX is a typesetting language, a hello world program does not need any specific output statement, instead the document just contains those words. The following code assumes LaTeX2e, for older LaTex, replace documentclass with documentstyle

First in any LaTeX document, the document class is set. Here the article class is used.

<<hello.tex>>=
\documentclass{article}


Here we could include some packages, set some values or make some definitions, but we don't need that here. So we directly start the document:

<<hello.tex>>=
\begin{document}
document content
\end{document}


Since this is a hello world program, the document content is quite simple:

<<document content>>=
Hello, world!


You can translate that document with

latex hello.tex


which creates the file hello.dvi which you can view with a dvi viewer, e.g. xdvi, or further process e.g. with

dvips hello.dvi -o hello.ps


to obtain a PostScript file. If you want to generate a PDF, you can instead use

pdflatex hello.tex


which translates the LaTeX source directly to PDF, which you can view e.g. with

acroread hello.pdf

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