Prolog code for dating service gratis dating sider norge

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/* Rule 5 */ yeye(X, Y) :- father(X, Z), father(Z, Y). /* Rule 4 */ grandparent(X, Y) :- parent(X, Z), parent(Z, Y). However wrapping the inner goal inside the double negation produces a goal that succeeds = stands for unification, it means that it will try to bind the free variables to make them match the other members. The inner goal succeeds if X and Y (which can be arbitrary terms) can be unified, and so will the double negation of that.The following are some common built-in predicates: Note that each of the built-in predicates above have two arguments, one on the left of the predicate and one on the right (just similar to other programming languages).However, user-defined predicates (as well as some other built-in predicates) must come before their arguments.See the following example: can be viewed as an extension of a fact with added conditions that also have to be satisfied for it to be true. The first part is similar to a fact (a predicate with arguments). Similar to goals, the predicate of a valid query must have appeared in at least one fact or rule in the consulted program, and the number of arguments in the query must be the same as that appears in the consulted program.The second part consists of other clauses (facts or rules which are separated by commas) which must all be true for the rule itself to be true. The purpose of submitting a query is to find values to substitute into the variables in the query such that the query is satisfied.

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/* Rule 3 */ grandmother(X, Y) :- mother(X, Z), parent(Z, Y).

/* Rule 2 */ grandfather(X, Y) :- father(X, Z), parent(Z, Y).

See the next page to see how the Prolog interpreter deals with goals and queries.

In addition to self-defined predicates, Prolog also provides built-in predicates.

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