global facts
xpositive(symbol,symbol)
xnegative(symbol,symbol)
predicates
animal_is(symbol) - nondeterm (o)
it_is(symbol) - nondeterm (i)
ask(symbol,symbol,symbol) - determ (i,i,i)
remember(symbol,symbol,symbol) - determ (i,i,i)
positive(symbol,symbol) - determ (i,i)
negative(symbol,symbol) - determ (i,i)
clear_facts - determ ()
run - determ ()
clauses
animal_is(cheetah):-
it_is(mammal),
it_is(carnivore),
positive(has,tawny_color),
positive(has,dark_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).
animal_is(zebra):-
it_is(ungulate),
positive(has,black_stripes).
animal_is(ostrich):-
it_is(bird),
negative(does,fly),
positive(has,long_neck),
positive(has,long_legs),
positive(has, black_and_white_color).
animal_is(penguin):-
it_is(bird),
negative(does,fly),
positive(does,swim),
positive(has,black_and_white_color).
animal_is(albatross):-
it_is(bird),positive(does,fly_well).
it_is(mammal):-
positive(has,hair).
it_is(mammal):-
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).
positive(X,Y):-
xpositive(X,Y),!.
positive(X,Y):-
not(xnegative(X,Y)),
ask(X,Y,yes).
negative(X,Y):-
xnegative(X,Y),!.
negative(X,Y):-
not(xpositive(X,Y)),
ask(X,Y,no).
ask(X,Y,yes):-
!,
write(X," it ",Y,'\n'),
readln(Reply),nl,
frontchar(Reply,'y',_),
remember(X,Y,yes).
ask(X,Y,no):-
!,
write(X," it ",Y,'\n'),
readln(Reply),nl,
frontchar(Reply,'n',_),
remember(X,Y,no).
remember(X,Y,yes):-
assertz(xpositive(X,Y)).
remember(X,Y,no):-
assertz(xnegative(X,Y)).
clear_facts:-
write("\n\nPlease press the space bar to exit\n"),
retractall(_,dbasedom),
readchar(_).
run:-
animal_is(X),!,
write("\nYour animal may be a (an) ",X),
nl,
clear_facts.
run:-
write("\nUnable to determine what"),
write("your animal is.\n\n"),
clear_facts.
goal
run.
Я пытаюсь запустить эту экспертную системную программу, но при компиляции я получаю следующую ошибку.
compiling C:/Users/daemon/Desktop/ch16E01.PRO for byte code...
C:/Users/daemon/Desktop/ch16E01.PRO:1:8: syntax error: . or operator expected after expression
C:/Users/daemon/Desktop/ch16E01.PRO:127:3: syntax error: . or operator expected after expression
2 error(s)
compilation failed