sc330_f2016:prolog1
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sc330_f2016:prolog1 [2018/10/26 02:23] morse |
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| To help you start, we've provided a [[smapleSolution.pl|sample solution]] to {{sc330_f2016:tie.png?linkonly|It's a tie}}. Use this as a model for your own Prolog solutions. | To help you start, we've provided a [[smapleSolution.pl|sample solution]] to {{sc330_f2016:tie.png?linkonly|It's a tie}}. Use this as a model for your own Prolog solutions. | ||
| - | ====Notes==== | + | ====Notes/Hints==== |
| *There are links above to the solutions (not the Prolog code) for these two puzzles so that you can double-check the results produced by your code. We strongly encourage taking a few minutes to solve these puzzles by hand so that you get a feel for how to solve them and the "facts" you're extracting from the clues in the puzzle. This will give you a better feel for what you need to encode in your Prolog solution as well as giving you a feel for what Prolog's trying to do under the hood. (And it's fun!) | *There are links above to the solutions (not the Prolog code) for these two puzzles so that you can double-check the results produced by your code. We strongly encourage taking a few minutes to solve these puzzles by hand so that you get a feel for how to solve them and the "facts" you're extracting from the clues in the puzzle. This will give you a better feel for what you need to encode in your Prolog solution as well as giving you a feel for what Prolog's trying to do under the hood. (And it's fun!) | ||
| *Just copy and paste the all_different function. It simply checks to make sure each item in the list is unique. | *Just copy and paste the all_different function. It simply checks to make sure each item in the list is unique. | ||
| *Check spelling errors. There is no such thing as misspelled atoms. So speigel and spiegel are both valid but different. | *Check spelling errors. There is no such thing as misspelled atoms. So speigel and spiegel are both valid but different. | ||
| - | *Once you have a solution, check it against the solutions we provide for the puzzles. If you're getting something different, you might not have sufficiently constrained the solution by extracting all of the information from the puzzle. (Or you might have just miscoded one of the facts.) | + | *Once you have a solution, check it against the solutions we provide for the puzzles. If you're getting something different, you might not have sufficiently constrained the solution by extracting all of the information from the puzzle. (Or you might have just miscoded one of the facts.) |
| + | *If you don't constrain the solution enough, you can get multiple possible answers. Even if you get lucky and happen to get the right answer as your first answer, especially if you only look at the first one found, that doesn't mean your Prolog code is correct. **There is exactly one solution to each puzzle.** | ||
| + | *Logic tips: | ||
| + | *"A implies B" or "if A then B" is equivalent to "(A and B) or (not A)". | ||
| + | *"if A then B; otherwise C" is equivalent to "(A and B) or ((not A) and C)". | ||
| *These problems make extensive use of the "not" operator, \+. | *These problems make extensive use of the "not" operator, \+. | ||
| * \+ works as you expect when all variables are completely bound. | * \+ works as you expect when all variables are completely bound. | ||
| * If E contains unbound variables, \+E will try to find bindings to that will make E true. If Successful \+ will fail. | * If E contains unbound variables, \+E will try to find bindings to that will make E true. If Successful \+ will fail. | ||
| * This lab is taken from [[http://www.cis.upenn.edu/~matuszek/cis554-2015/Assignments/prolog-1-logic-puzzles.html|this site]]. There may be additional resources there. | * This lab is taken from [[http://www.cis.upenn.edu/~matuszek/cis554-2015/Assignments/prolog-1-logic-puzzles.html|this site]]. There may be additional resources there. | ||
sc330_f2016/prolog1.txt · Last modified: 2021/06/30 23:42 (external edit)
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