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lab5.pl
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lab5.pl
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null.
tree(_,null,null) :- !.
tree(_, tree(_,_,_),tree(_,_,_)) :-
!.
present(Key,tree(Key,_,_)) :- !.
present(Key,tree(_,Ltree,_)) :-
present(Key,Ltree).
present(Key,tree(_,_,Rtree)) :-
present(Key,Rtree).
add(null, 0) :- !.
add(tree(Key,null,null),Key) :- !.
add(tree(Key,Ltree,Rtree),S) :-
add(Ltree,SI),
add(Rtree,SII),
S is SI + SII + Key.
count_leaves(null,0) :- !.
count_leaves(tree(_,null,null), 1) :-
!.
count_leaves(tree(_,Ltree,Rtree),Count) :-
count_leaves(Ltree,CI),
count_leaves(Rtree,CII),
Count is CI + CII.
compute(tree(Key,null,null),Key) :- !.
compute(tree(+,Ltree,Rtree),Result) :-
compute(Ltree,RI),
compute(Rtree,RII),
Result is RI + RII.
compute(tree(-,Ltree,Rtree),Result) :-
compute(Ltree,RI),
compute(Rtree,RII),
Result is RI - RII.
compute(tree(*,Ltree,Rtree),Result) :-
compute(Ltree,RI),
compute(Rtree,RII),
Result is RI * RII.
compute(tree(/,Ltree,Rtree),Result) :-
compute(Ltree,RI),
compute(Rtree,RII),
Result is RI / RII.
converting(N,tree(N,null,null)) :-
number(N), !.
converting(E1+E2,tree(+, R1, R2)) :-
converting(E1,R1),
converting(E2,R2).
converting(E1-E2,tree(-, R1, R2)) :-
converting(E1,R1),
converting(E2,R2).
converting(E1*E2,tree(*, R1, R2)) :-
converting(E1,R1),
converting(E2,R2).
converting(E1/E2,tree(/, R1, R2)) :-
converting(E1,R1),
converting(E2,R2).