[quiz] [QUIZ #1] A Text-based CAPTCHA

[Richard Newman]

I'm assuming that the list itself is the right place to deliver  
solutions!

Here is mine, for what it's worth.

<http://www.holygoat.co.uk/lisp/cl-quiz/captcha.lisp>

* (generate-captcha)
"what is 7 minus 3?"
"4"

* (generate-captcha :elements 4 :depth 1)
"what is 8 times 7 times 1 times 6?"
"336"

It's a bit kludgy -- disrespecting as it does infix operator  
precedence, so (> depth 1) is unlikely to calculate correctly -- but  
it was fun to write! A good Sunday morning's finger exercise.

-R