Warp wrote:
>   A purely functional programming language doesn't have side-effects.

The trick is to embed the purely functional programming language into a 
larger system that does the I/O. For example, have a CGI script that 
takes its input and generates output from that functionally, and let the 
web server do the I/O part.  POV-Ray could be purely functional, except 
for a small shell that reads the input file into a buffer (ignoring 
includes and such) and another that takes the calculated pixels and 
outputs them to the destination file.

-- 
   Darren New / San Diego, CA, USA (PST)
     On what day did God create the body thetans?

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