1
xpositive(symbol,symbol).
xnegative(symbol,symbol).
run:-animal_is(X), !,write("\nYour animal may be a"),write(X),nl, nl, clear_facts.
run:-write("\nUnable to determine what"),clear_facts.
positive(X,Y):-write("\npositive(X,Y)0\n"),xpositive(X, Y), ! .
positive(X,Y):-write("\npositive(X,Y)1\n"),not(xnegative(X, Y)),ask(X, Y).
negative(X,Y):-write("\nnegative(X,Y)0\n"),xnegative(X, Y), !.
negative(X,Y):-write("\nnegative(X,Y)1\n"),not(xpositive(X, Y)),ask(X, Y).
ask(X,Y):-write("\nask \n"),write(X),write(" it "),write(Y),readln(R),write("\n0000000000000\n"),new_rules(X,Y,R).
new_rules(X, Y, y):-write("\n01111111111110\n"),assert(xpositive(X, Y)).
new_rules(X, Y, n):-write("\n02222222222220\n"),assert(xnegative(X, Y)), fail.
clear_facts:-retract(xpositive(_,_)) , fail.
clear_facts:-retract(xnegative(_,_)), fail.
clear_facts:-write("\nExit\n").
it_is(mammal):-write("\nit_is(mammal)0\n"),positive(has, hair).
it_is(mammal):-write("\nit_is(mammal)1\n"),positive(does, give_milk).
it_is(bird):-positive(has, feathers).
it_is(bird):-positive(does, fly),positive(does, lay_eggs).
it_is(carnivore):-positive(does, eat_meat).
it_is(carnivore):-positive(has, pointed_teeth),positive(has, claws),positive(has, forward_eyes).
it_is(ungulate):-it_is(mammal),positive(has, hooves).
it_is(ungulate):-it_is(mammal),positive(does, chew_cud).
animal_is(cheetah):-it_is(mammal) , it_is(carnivore),positive(has, tawny_color),positive(has, black_spots).
animal_is(tiger) :-it_is(mammal),it_is(carnivore) , positive(has, tawny_color) , positive(has,black_stripes).
animal_is(giraffe):- it_is(ungulate) ,positive(has, long_neck) , positive(has, long_legs),positive(has, dark-_spots) .
以上是我的序言碼(從網上下載),這些行:專家系統使用序言和有一個預測,就決不會滿意
ask(X,Y):-write("\nask \n"),write(X),write(" it "),write(Y),readln(R),write("\n0000000000000\n"),new_rules(X,Y,R).
new_rules(X, Y, y):-write("\n01111111111110\n"),assert(xpositive(X, Y)).
new_rules(X, Y, n):-write("\n02222222222220\n"),assert(xnegative(X, Y)), fail.
手段來詢問用戶的問題,然後向系統中提出新的事實。但是由於「011111110」或「02222220」無法打印到屏幕上,因此無法滿足預測「new_rules」,因此係統無法使用答案!我只是不知道爲什麼!!非常感謝您的所有建議!!!!!!