turbo-prolog - Turbo Prolog 中的斐波那契数列

Question

尝试执行此 turbo prolog 代码但给出错误。

predicates
fibo(integer,integer)

clauses
fibo(0,0).
fibo(1,1).
fibo(X,N):-
N>1,
N1=N-1,
N2=N-2,
fibo(F1,N1),
fibo(F2,N2),
F=F1+F2,
write(F),write(",").