Predicate in prolog -


i need define predicate in prolog takes list input , sums squares of numbers >= 5 , subtract sum of absolute value of numbers <=2.

this have :- 

pred([], 0). pred([head|tail], result) :-     gr85(head),     pred(tail, total),     result head*head + total.  pred([head|tail], result) :-     leq2(head),     pred(tail, total),     result total - head.  gr85(number):-     number >= 5.  leq2(number):-     number =< 2.

my question how exclude between 2 , 5. if input 3 in list, returns false.

expected input

pred([3,6,2,-1], result).

expected output

result= 33 (6*6 -2-1)

add 'skip all' clause:

weird_sum([_|tail], result) :- weird_sum(tail, result).

i think gain insight prolog working when analyze where clause should added.


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