I need to make a predicate that receives a numeric list and print only the numbers that end in 7 and that the sum of its digits is greater than 100
I made the predicates for separated but I need help making a union of the two predicates, I mean that the two predicates go into one only predicate, this is what I did so far:
%sum of digits greater than 100
multi(X):-
0 is X mod 100
sum([],0).
sum([P|Q],Z).
multi(P), sum(Q,Z1), Z is P + Z1.
sum([P|Q],Z).
not multi(P), sum(Q,Z).
%print the numbers that end in 7
end(Y):-
7 is Y mod 10.
listend([],0).
listend([P|Q]):-
end(P),write(P), nl, listend(Q).
listend([P|Q]):-
not(end(P)), listend(Q).
This works for me:
?- filter([147, 24, 57, 17, 3667], X), write(X), nl, fail.
sumdigits(0, 0).
sumdigits(X, Z) :-
X > 0,
Z1 is X mod 10,
X2 is X // 10,
sumdigits(X2, Z2),
Z is Z1 + Z2.
filter([], []).
filter([H|X], [H|Y]) :-
sumdigits(H, D),
D > 10,
7 is H mod 10, !,
filter(X, Y).
filter([_|X], Y) :- filter(X, Y).
I get:
[147, 57, 3667]
No.
I assumed you meant that the sum of the digits was greater than 10, rather than 100.
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