SWI-Prolog a) Write a predicate called lastEle(Atom,List) to find the last element of a list. You...
SWI-Prolog
a) Write a predicate called lastEle(Atom,List) to find the last
element of a list. You may not use the built-in last
predicate in your answer.
E.g.,
?- lastEle(X,[how,are,you,today]). X=today.
b) Write a predicate gradeMap(L,R), where L is a list of
percentage grade values (integers from 0 to 100), and R is a list
of corresponding grade letters (a-f, no +/-'s). You may assume the
grade list contains the correct types.
E.g.,
?-gradeMap([0, 16, 49, 55, 63, 78, 92], R). R=[f,f,f,d,c,b,a]
Homework Answers
Answer a:
%The following is the prolog code for the same.
lastEle(Y,[Y]).
lastEle(X,[Head|R]):-lastEle(X,R).
Answer b:
gradeMap([],[]).
gradeMap(L,R):-maplist(grade,L,R),!.
grade(V,a) :- V>=80.
grade(V,b) :- V>=70,V<80.
grade(V,c) :- V>=60,V<70.
grade(V,d) :- V>=50,V<60.
grade(V,f) :- V<50.
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