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Prolog quiz

Prolog quiz

Prolog quiz

(OP)
I created a small program for finding out which is the risk to have cardiovascular diseases.
The problem is when I type something different than y(yes).. it doesn't always stop and keeps asking me the same questions. How can I make it stop and accept all kinds of answers?
Thanks a lot!

predicates
   risk(symbol)
   age(symbol)
   smoke(symbol)
   diabet(symbol)
   obesity(symbol)
rel(symbol,symbol)
   infl_age(integer)
   infl_smoke(integer)
   infl_diabet(integer)
   infl_obesity(integer)

clauses
                  

risk(extreme) if infl_age(A),infl_smoke(B),infl_diabet(C),infl_obesity(D), A+B+C+D>90.
risk(big) if infl_age(A),infl_smoke(B),infl_diabet(C),infl_obesity(D), A+B+C+D>70.
risk(medium) if infl_age(A),infl_smoke(B),infl_diabet(C),infl_obesity(D), A+B+C+D>40.
risk(low) if infl_age(A),infl_smoke(B),infl_diabet(C),infl_obesity(D), A+B+C+D>20.
risk(safe) if !.

   age(X) if rel(age,X).
   smoke(X) if rel(smoke,X).
   diabet(X) if rel(diabet,X).
   obesity(X) if rel(obesity,X).
   rel(Atribut,Valoare) if write(Atribut,":",Valoare,"?"), readln(R), R="y".
 
 
infl_age(20) if age(over_50),!.
infl_age(10) if age(between_30_and_50),!.
infl_age(0) if !.

infl_smoke(30) if smoke(do_you_smoke),!.
infl_smoke(0) if !.

infl_diabet(25) if diabet(are_you_diabetic),!.
infl_diabet(0)if !.

infl_obesity(25) if obesity(are_you_a_fat_person),!.
infl_obesity(0) if !.

goal
 
 risk(X),
        write("the risk for having cardiovascular ilnesses is:",X).
 

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