This version of Learn Prolog Now! embeds SWI SH , SWI-Prolog for SHaring. The current version rewrites the Learn Prolog Now! HTML on the fly, recognising source code and example queries. It is not yet good at recognising the relations between source code fragments and queries. Also Learn Prolog Now! needs some updating to be more compatible with SWI-Prolog. All sources are on GitHub:
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Chapter 10
Cuts and Negation

This chapter has two main goals:

  1. To explain how to control Prolog’s backtracking behaviour with the help of the cut predicate.
  2. To explain how cut can be packaged into a more structured form, namely negation as failure.

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© 2006-2012 Patrick Blackburn, Johan Bos, Kristina Striegnitz