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Ingy döt Net 2013-10-27 22:24:23 +00:00
parent 6f050a029e
commit 776bba907c
3887 changed files with 59894 additions and 7280 deletions
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Task/Fibonacci-sequence/Prolog/fibonacci-sequence-9.pro
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% Fibonacci sequence generator
fib(C, [P,S], C, N) :- N is P + S.
fib(C, [P,S], Cv, V) :- succ(C, Cn), N is P + S, !, fib(Cn, [S,N], Cv, V).
take( 0, Next, Z-Z, Next).
take( N, Next, [A|B]-Z, NZ):- N>0, !, next( Next, A, Next1),
N1 is N-1,
take( N1, Next1, B-Z, NZ).
fib(0, 0).
fib(1, 1).
fib(C, N) :- fib(2, [0,1], C, N). % Generate from 3rd sequence on
next( fib(A,B), A, fib(B,C)):- C is A+B.
%% usage: ?- take(15, fib(0,1), _X-[], G), writeln(_X).
%% [0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377]
%% G = fib(610, 987)