Prolog another simple question

Question

How do i read in char type by users if they are a- , b+ , o+ ? I don't seem to have problem reading in char like a , b , c or d. i am using read(X) . Can someone help me out with this ? Thanks in advance.

Answer 1

As I remember read/1 reads the term. If you want to read characters you may consider get_char/1 or something like that

?- get_char(X),get_char(Y).
|: a-

X = a,
Y = (-).

Answer 2

I managed to solve the problem using read_string() . :)