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# PROLOG ΜΑΘΗΜΑ 5 (ΕΚΤΥΠΩΣΗ)

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A.Θεωρία
Οπισθοδρόμηση
Μη προσδοκώμενα αποτελέσματα
Το κατηγόρημα ! /0
Βίαιος Τερματισμός Προγράμματος
Το κατήγορημα fail / 0
B.Ασκήσεις

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### PROLOG ΜΑΘΗΜΑ 5 (ΕΚΤΥΠΩΣΗ)

1. 1. 31 PROLOG 5: !"# \$%&' ( ) ' ! " # # \$ % # & '()* ! + , & # . ! 1. 1. "# \$ % " !& \$ ' # : !"# \$%&' ( ) ' (" " : max(X,Y,M):- X>Y, M=X. max(X,Y,M):- X=<Y, M=Y. ?- max(4,5, ). " ! " " " ! ?- max(4,5, ). = 5. ?- max(5,4, ). = 5 ; false. . ! 1. 1. "# \$ ) ! * + ! * * \$ " \$ : *!"# \$%&' ( ) ' : max(4,5, ). max(X,Y,M):- X>Y, M=X. max(X,Y,M):- X=<Y, M=Y. : max(4,5, ). : 4>5, =4. X=4, =5, = X=4, =5, = : 4=<5, =5. ?- max(4,5,N). N = 5. : =5. : N=5 ?- max(5,4,N). N = 5 ; false. : max(5,4, ). : 5=<4, =4. X=5, =4, = false X=5, =4, = : 5>4, =5. : =5. : N=5
2. 2. . ! 1. 2. To " ! / 0 % " ! / 0 ( + & cut) ! \$ : !"# \$%&' ( ) ' : " \$ * * . \$ , . - * ! " , * ! % !& * , * \$ * \$ ! ! * ! " . # * * " max ' :# * * " max ' : max(X,Y,M):- X>Y,!, M=X. max(X,Y,M):- X=<Y, M=Y. . ! 1. 2. To " ! / 0 . \$ * " \$ * " \$ +!"# \$%&' ( ) ' : max(4,5, ). max(X,Y,M):- X>Y,!, M=X. max(X,Y,M):- X=<Y, M=Y. : 4>5,!, =4. X=4, =5, = X=4, =5, = : 4=<5, =5. ?- max(4,5,N). N = 5. : =5. : N=5 : max(5,4, ). X=5, =4, =X=5, =4, = ?- max(5,4,N). N = 5.: 5=<4, =4. X=5, =4, =X=5, =4, = : 5>4,!, =5. : =5. : N=5 : !, =5. . ! 1. 2. To " ! / 0 * ! \$ * " /\$ . ,!"# \$%&' ( ) ' . 0 * ! # * " if-else 1 * ! * " : max(X,Y,M):- X>Y,!, M=X. max(X,Y,M):- max(X,Y,M):- X>Y,!, M=X. max(X,Y,M):- max(X,Y, ):- X>Y,!. max(X,Y, ). max(X,Y,M):- X=<Y, M=Y. max(X,Y,M):- M=Y. max(X,Y, ). . ! 2. . ! % 1. To " fail / 0 % " fail / 0 ! " * ! : -!"# \$%&' ( ) ' " \$ * * . ( "" ) * " " . 2 \$ * " * " # ! fail !& * * ! * . (! ! & " + ! * \$ ! * " \$ * " .
3. 3. .. " (, 1 " Prolog: .!"# \$%&' ( ) ' first:- room(X), write(X), nl, fail. 0 ! " : (a1) first. (a2) second.fail. second:- room(X), !, write(X), nl, fail. third:- room(X), write(X), nl, !, fail. fourth:- !, room(X), write(X), (a2) second. (a3) third. (a4) fourth. (a5) fifth. ) " \$ ! ! " : (1) (2) (3) (4) (5) a a b a a b a b write(X), nl, fail. fifth:- room(X), write(X), nl, fail, !. room(a). room(b). room(c). room(d). ) / , & * , . . a3->2 No c d No No c d No c d No .. " (, 1 /!"# \$%&' ( ) ' !"# \$%&' ( ) ' .. " (, 2 ( ) f(X,Y):- X<0,!, Y=0. ( ) f(X,Y):- X<0,!, Y=0. f(_,0). ( ) f(X,Y):- X>=0, !, Y=0. f(_,1). ( ) f(X,Y):- X<0, !, Y=0. f(_,1). ( ) f(_,1). f(X,Y):- X<0, !, Y=0. .. " (, 2 !"# \$%&' ( ) '