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POProlog - Rules are correct, but not outputting the way it's supposed to?
 

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  1. POProlog - Rules are correct, but not outputting the way it's supposed to?
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    <p><strong>Clue</strong></p> <p>Four guests (Colonel Mustard, Professor Plum, Miss Scarlett, Ms. Green) attend a dinner party at the home of Mr. Boddy. Suddenly, the lights go out! When they come back, Mr Boddy lies dead in the middle of the table. Everyone is a suspect. Upon further examination, the following facts come to light:</p> <ul> <li>Mr Boddy was having an affair with Ms. Green.</li> <li>Professor Plum is married to Ms. Green.</li> <li>Mr. Boddy was very rich.</li> <li>Colonel Mustard is very greedy.</li> <li>Miss Scarlett was also having an affair with Mr. Boddy.</li> </ul> <p>There are two possible motives for the murder: </p> <ul> <li>Hatred: Someone hates someone else if that other person is having an affair with his/her spouse.</li> <li>Greed: Someone is willing to commit murder if they are greedy and not rich, and the victim is rich.</li> </ul> <p>Part A: Write the above facts and rules in your Prolog program. Use the following names for the people: colMustard, profPlum, missScarlet, msGreen, mrBoddy. Be careful about how you encode (or don’t encode) symmetric relationships like marriage - you don’t want infinite loops! <code>married(X,Y) :- married(Y,X) % INFINITE LOOP</code></p> <pre><code>?-suspect(Killer,mrBoddy) Killer = suspect_name_1 Killer = suspect_name_2 etc. </code></pre> <p>Part B: Write a predicate, suspect/2, that determines who the suspects may be, i.e. who had a motive.</p> <pre><code>?-suspect(Killer,mrBoddy) Killer = unique_suspect. </code></pre> <p>Part C: Add a single factto your database that will result in there being a unique suspect. Clearly indicate this line in your source comments so that it can be removed/added for grading.</p> <pre><code>?-suspect(Killer,mrBoddy) Killer = unique_suspect. </code></pre> <hr> <p>Whenever I type in </p> <pre><code>suspect(Killer,mrBoddy). </code></pre> <p>I get </p> <pre><code>suspect(Killer,mrBoddy). Killer = profPlum </code></pre> <p>I'm missing </p> <pre><code>Killer = colMustard. </code></pre> <p>Here's my source.</p> <pre><code>%8) Clue %facts affair(mrBoddy,msGreen). affair(missScarlett, mrBoddy). affair(X,Y) :- affair(X,Y), affair(Y,X). married(profPlum, msGreen). married(X,Y) :- married(X,Y), married(Y,X). rich(mrBoddy). greedy(colMustard). %rules hate(X,Y) :- married(X,Spouse), affair(Y,Spouse). greed(X,Y) :- greedy(X), not(rich(X)), rich(Y). %suspect suspect(X,Y):- hate(X,Y). suspect(X,Y):- greed(X,Y). </code></pre>
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    1. USBadJo0Jo0
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      1. POProlog - Rules are correct, but not outputting the way it's supposed to?
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    1. CODid you ask prolog about another killer? By using ; after you get the first solution printed?
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      1. POProlog - Rules are correct, but not outputting the way it's supposed to?
      1. USssBarBee
    2. COWow I wasn't aware of that. Thanks so much!
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      1. USBadJo0Jo0
    3. COYou will get into an endless loop when trying to get the second solution.
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      1. POProlog - Rules are correct, but not outputting the way it's supposed to?
      1. USPaulo Moura
 

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