Math & Science ⇒ Problem including algorithm file

[kotoko]

Hello!

I'm trying to get to grips with writing algorithms.
I've managed to write a file that compiles but want to transform it into a file to be included in another project.

What happens: if I use just one file all goes well if I put the same code in another file and input it I get

Code: Select all

(/usr/local/texlive/2009/texmf-dist/tex/latex/base/omscmr.fd) (./algoritmos.tex


! LaTeX Error: Can be used only in preamble.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.1 \documentclass
                  [a4paper,portuges]{book}

I don't really understand how just changing the place of the code can have that effect.
I attach a version of the code. If you comment and uncomment the input line you'll se what I mean.

[kaiserkarl13]

Your document attempts to include itself in the source file, and it's getting stuck at the second appearance of \documentclass.

Change the \input line to include the correct file and you should be fine.